diff --git a/include/debug_menu.h b/include/debug_menu.h
index 51bdec32c..7e20bcd42 100644
--- a/include/debug_menu.h
+++ b/include/debug_menu.h
@@ -33,8 +33,7 @@ struct unkStruct_203B3F8
     u16 unk6;
     struct PokemonStruct *pokemon;
     u32 unkC;
-    const char *unk10;
-    u8 fill14[0x60 - 0x14];
+    struct MenuStruct unk10;
     u32 unk60;
     u32 unk64;
     u32 unk68;
diff --git a/include/kecleon_items.h b/include/kecleon_items.h
index db4827c48..b952896b1 100644
--- a/include/kecleon_items.h
+++ b/include/kecleon_items.h
@@ -25,8 +25,7 @@ struct unkStruct_203B210
     u32 unk30;
     struct MenuItem unk34[8];
     u16 unk74[8];
-    u32 unk84;
-    u8 fill88[0xD4 - 0x88];
+    struct MenuStruct unk84;
     struct OpenedFile *faceFile;
     u8 *unkD8;
     u16 unkDC;
diff --git a/include/mailbox.h b/include/mailbox.h
index 22133e0c4..79e4d1e41 100644
--- a/include/mailbox.h
+++ b/include/mailbox.h
@@ -19,8 +19,7 @@ struct unkStruct_203B304
     u8 fill51[0x64 - 0x51];
     u32 unk64;
     u32 unk68;
-    u32 unk6C;
-    u8 fill70[0xBC - 0x70];
+    struct MenuStruct unk6C;
     struct MenuItem unkBC[8];
     u16 unkFC[8];
     struct UnkTextStruct2 unk10C[4];
diff --git a/include/menu.h b/include/menu.h
index 528954bd8..bf663e5e4 100644
--- a/include/menu.h
+++ b/include/menu.h
@@ -11,7 +11,7 @@ struct MenuStruct
 {
     // size: 0x50
     u8 *unk0;
-    /* 0x4 */ struct MenuItem *menuItems;
+    /* 0x4 */ const struct MenuItem *menuItems;
     const u32 *menuTextColorArray;
     u16 *unkC;
     /* 0x10 */ s32 index;
@@ -23,9 +23,9 @@ struct MenuStruct
     u16 unk38;
     u8 fill3A[0x48 - 0x3A];
     /* 0x48 */ s32 menuAction;
-    u8 unk4C;
-    u8 unk4D;
-    u8 unk4E;
+    bool8 unk4C;
+    bool8 unk4D;
+    bool8 unk4E;
 };
 
 #endif // GUARD_MENU_H
diff --git a/include/menu_input.h b/include/menu_input.h
new file mode 100644
index 000000000..bed65b0e5
--- /dev/null
+++ b/include/menu_input.h
@@ -0,0 +1,15 @@
+#include "menu.h"
+
+void sub_8012BC4(u32 x, u32 y, s32 n, s32 len, u32 param_5, u32 param_6);
+void sub_8012C60(u32 x,u32 y,u32 param_3,u32 param_4,u32 param_5);
+void sub_8012CAC(struct UnkTextStruct2 *param_1, const struct MenuItem *param_2);
+void sub_8012D08(struct UnkTextStruct2 *param_1, s32 param_2);
+void sub_8012D34(struct UnkTextStruct2 *param_1, s32 param_2);
+void sub_8012D60(struct MenuStruct *param_1,const struct MenuItem *menuItems,u32 *colorArray,u16 *param_4,s32 param_5, s32 index);
+void sub_8012E04(struct MenuStruct *param_1,const struct MenuItem *menuItems,u32 *colorArray,u16 *param_4,s32 param_5, s32 index);
+void sub_8012EA4(struct MenuStruct *param_1, bool8 r1);
+void sub_8012EBC(struct MenuStruct *param_1);
+u8 sub_8012FD8(struct MenuStruct *param_1);
+u8 sub_80130A8(struct MenuStruct *param_1);
+bool8 sub_8013114(struct MenuStruct *param_1, s32 *menuAction);
+
diff --git a/include/wonder_mail_3.h b/include/wonder_mail_3.h
index ceac36012..3d161c449 100644
--- a/include/wonder_mail_3.h
+++ b/include/wonder_mail_3.h
@@ -1,3 +1,4 @@
+#include "menu.h"
 struct unkStruct_203B2F4
 {
     u8 fill0[0x1A];
@@ -50,9 +51,8 @@ struct unkStruct_203B2F8
     u32 unk6C;
     u32 unk70;
     u32 unk74;
-    u8 unk78[0xC8 - 0x78];
-    u8 unkC8[4];
-    u8 fillCC[0x118 - 0xCC];
+    struct MenuStruct unk78;
+    struct MenuStruct unkC8;
     struct MenuItem unk118[8];
     struct MenuItem unk158[8];
     u16 unk198[8];
diff --git a/src/adventure_log.c b/src/adventure_log.c
index a8b622116..05e5dabd9 100644
--- a/src/adventure_log.c
+++ b/src/adventure_log.c
@@ -3,6 +3,7 @@
 #include "input.h"
 #include "memory.h"
 #include "text.h"
+#include "menu_input.h"
 
 struct AdventureLog
 {
@@ -62,7 +63,6 @@ extern void xxx_call_draw_string(s32, u32, const u8 *, u32, u32);
 extern void sub_8008C54(u32);
 extern void sub_80073B8(u32);
 extern void sub_80073E0(u32);
-extern void sub_8012BC4(u32 x, u32 y, u32, u32, u32, u32);
 extern void xxx_format_and_draw(u32, u32, const char *, u32, u32);
 const u8 *GetAdventureLogLine(u8 index);
 extern s32 sub_8013800(void *, s32);
diff --git a/src/code_801B3C0.c b/src/code_801B3C0.c
index b7e915560..6b7f3952e 100644
--- a/src/code_801B3C0.c
+++ b/src/code_801B3C0.c
@@ -7,6 +7,7 @@
 #include "menu.h"
 #include "pokemon.h"
 #include "team_inventory.h"
+#include "menu_input.h"
 
 struct subStruct_203B240
 {
@@ -45,10 +46,8 @@ struct unkStruct_203B234
     struct unkStruct_8090F58 unk14;
     struct Item unk20;
     u32 unk24;
-    u32 unk28;
-    u8 fill2C[0x78 - 0x2C];
-    u32 unk78;
-    u8 fill7C[0xC8 - 0x7C];
+    struct MenuStruct unk28;
+    struct MenuStruct unk78;
     u32 unkC8;
     struct MenuItem unkCC[5];
     struct UnkTextStruct2 unkF4[4];
@@ -78,7 +77,6 @@ extern struct UnkTextStruct2 gUnknown_80DBA88;
 extern struct UnkTextStruct2 gUnknown_80DBA70;
 
 extern void sub_801BB5C(void);
-extern void sub_8012CAC(struct UnkTextStruct2 *, struct MenuItem *);
 extern struct PokemonStruct *GetPlayerPokemonStruct(void);
 extern void sub_801B748(u32);
 extern void sub_8008C54(u32);
@@ -90,8 +88,6 @@ extern void sub_8013F84(void);
 extern u32 sub_8012A64(u32 *, u32);
 extern s32 sub_80913E0(struct Item *, u32, struct subStruct_203B240 **);
 extern void sub_80141B4(u8 *, u32, u32 *, u32);
-extern void sub_8012EA4(u32 *, u32);
-extern void sub_8012D60(u32 *, struct MenuItem *, u32, u16 *, u32, u32);
 extern void sub_801BB20(void);
 extern void sub_801A8D0(u32);
 extern void sub_801A9E0(void);
diff --git a/src/debug_menu_2.c b/src/debug_menu_2.c
index 56c73c648..093b6766f 100644
--- a/src/debug_menu_2.c
+++ b/src/debug_menu_2.c
@@ -5,6 +5,7 @@
 #include "input.h"
 #include "menu.h"
 #include "debug_menu.h"
+#include "menu_input.h"
 
 extern struct unkStruct_203B3F8 *gUnknown_203B3F8;
 extern struct UnkTextStruct2 gUnknown_80E7ED4;
@@ -17,7 +18,6 @@ extern void sub_80073B8(u32);
 extern void sub_8013C68(u32 *);
 extern void sub_80073E0(u32);
 extern void sub_8023DA4(void);
-extern void sub_8012EA4(const char **, u32);
 extern void xxx_call_draw_string(u32, u32, u8 *, u32, u32);
 
 void sub_803ACD0(u32);
@@ -35,8 +35,6 @@ extern void sub_803AE58();
 extern void sub_801602C(u32, u8 *);
 
 extern void sub_803AEB0();
-extern void sub_8012CAC(struct UnkTextStruct2 *, struct MenuItem *);
-extern void sub_8012D60(const char **, struct MenuItem *, u32, u16 *, u32, u32);
 
 u32 sub_803AC24(void)
 {
diff --git a/src/debug_menu_mid.c b/src/debug_menu_mid.c
index 27c8bcf6f..976bb8e22 100644
--- a/src/debug_menu_mid.c
+++ b/src/debug_menu_mid.c
@@ -5,6 +5,7 @@
 #include "memory.h"
 #include "menu.h"
 #include "text.h"
+#include "menu_input.h"
 
 struct unkStruct_203B3F0
 {
@@ -14,8 +15,7 @@ struct unkStruct_203B3F0
     u8 fill5[0x8 - 5];
     u32 unk8;
     struct MenuItem menuItems[8];
-    u32 unk4C;
-    u8 fill50[0x9C - 0x50];
+    struct MenuStruct unk4C;
     u32 unk9C;
     u32 unkA0;
     u32 unkA4;
@@ -39,8 +39,7 @@ struct unkStruct_203B3F4
     u8 fill5[0x8 - 5];
     u32 unk8;
     struct MenuItem menuItems[8];
-    u32 unk4C;
-    u8 fill50[0x9C - 0x50];
+    struct MenuStruct unk4C;
     struct UnkTextStruct2 unk9C[4];
 };
 
@@ -63,18 +62,14 @@ extern const char *gUnknown_80D4970[];
 extern void sub_801C8C4(u32, u32, u32, u32);
 extern void sub_801CB5C(u32);
 extern void sub_801CCD8();
-extern void sub_8012D60(u32 *, struct MenuItem *, u32, u32, u32, u32);
 extern void sub_8008C54(u32);
 extern void sub_80073B8(u32);
-extern void sub_8012EA4(u32 *, u32);
 extern void sub_80073E0(u32);
 extern void sub_8013C68(u32 *);
 extern void xxx_call_draw_string(s32, u32, const char *, u32, u32);
 extern u32 sub_801CA08(u32);
 extern u8 sub_801CB24();
 extern void sub_801CBB8();
-extern u8 sub_8012FD8(u32 *);
-extern void sub_8013114(u32 *, s32 *);
 extern u32 sub_8013BBC(u32 *);
 extern u32 sub_801B410();
 extern void sub_801B450();
diff --git a/src/felicity_bank_1.c b/src/felicity_bank_1.c
index d9e4fc57d..504e487fd 100644
--- a/src/felicity_bank_1.c
+++ b/src/felicity_bank_1.c
@@ -2,6 +2,7 @@
 #include "item.h"
 #include "team_inventory.h"
 #include "felicity_bank.h"
+#include "menu_input.h"
 
 extern struct unkStruct_203B204 *gUnknown_203B204;
 
@@ -14,7 +15,6 @@ extern u8 *gFelicityDeposit;
 extern void sub_8008C54(u32);
 extern void sub_80073B8(u32);
 extern void xxx_call_draw_string(s32 x, u32 y, u8 *, u32 , u32);
-extern void sub_8012BC4(u32 x, u32 y, u32, u32, u32, u32);
 extern void sub_80073E0(u32);
 extern void sub_8013C68(u32 *);
 extern s32 sub_80144A4(s32 *);
diff --git a/src/kecleon_items_1.c b/src/kecleon_items_1.c
index fc6476250..1feb29807 100644
--- a/src/kecleon_items_1.c
+++ b/src/kecleon_items_1.c
@@ -8,6 +8,7 @@
 #include "kecleon_items.h"
 #include "team_inventory.h"
 #include "code_800D090.h"
+#include "menu_input.h"
 
 extern struct unkStruct_203B210 *gUnknown_203B210;
 extern u16 gUnknown_203B218;
@@ -35,8 +36,6 @@ extern u32 sub_801B410(void);
 extern void sub_801B450(void);
 
 extern void sub_8099690(u32);
-extern u8 sub_8012FD8(u32 *);
-extern void sub_8013114(u32 *, u32 *);
 extern u32 sub_8019EDC(u8);
 extern u32 sub_801A2A8(u8);
 extern s32 sub_801A8AC(void);
@@ -48,12 +47,10 @@ extern void sub_80073B8(u32);
 extern void sub_80073E0(u32);
 extern s32 sub_8013800(void *, u32);
 extern void  xxx_call_draw_string(s32 x, s32, u8 *, u32, u32);
-extern void sub_8012BC4(s32, s32, s32, s32, s32, s32);
 extern void xxx_format_and_draw(u32, u32, u8 *, u32, u32);
 extern s32 sub_801AED0(s32);
 void sub_8007B7C(s32, s32, s32, s32, s32);
 extern void sub_801AE84(void);
-extern void sub_8012D08(void *, u32);
 extern void sub_801A998(void);
 extern void sub_801A9E0(void);
 extern void Kecleon_SortItems(void);
diff --git a/src/load_screen.c b/src/load_screen.c
index 45b0f2a25..23af94777 100644
--- a/src/load_screen.c
+++ b/src/load_screen.c
@@ -11,6 +11,7 @@
 #include "save.h"
 #include "code_800D090.h"
 #include "code_8094F88.h"
+#include "menu_input.h"
 
 extern const struct FileArchive gTitleMenuFileArchive;
 
@@ -41,8 +42,6 @@ void sub_80397B4(void);
 
 extern void sub_8035CF4(struct MenuStruct *, u32, u32);
 extern void SetMenuItems(struct MenuStruct *, struct UnkTextStruct2 *, u32, const struct UnkTextStruct2 *, const struct MenuItem *, u32, u32, u32);
-extern u8 sub_8012FD8(struct MenuStruct *);
-extern void sub_8013114(struct MenuStruct *, u32 *);
 
 extern void sub_80920D8(u8 *);
 extern struct PokemonStruct *GetPlayerPokemonStruct(void);
diff --git a/src/mailbox.c b/src/mailbox.c
index 31516219a..490341886 100644
--- a/src/mailbox.c
+++ b/src/mailbox.c
@@ -5,6 +5,7 @@
 #include "input.h"
 #include "mailbox.h"
 #include "wonder_mail.h"
+#include "menu_input.h"
 
 
 extern void HandleMailboxMenu(void);
@@ -71,11 +72,9 @@ static const u8 mailbox_fill[] = "pksdir0";
 
 extern struct unkStruct_203B304 *gUnknown_203B304;
 extern void sub_802E088(u32);
-extern void sub_8012CAC(struct UnkTextStruct2 *, struct MenuItem *);
 extern void CreateMailboxMenu(void);
 extern void CreateMailActionMenu(void);
 
-extern void sub_8012D60(u32 *, struct MenuItem *, u32, u16 *, u32, u32);
 extern void sub_802BD14(u32, u32, u32);
 extern void sub_802BE94(u32);
 extern void CreateMailMenu(void);
diff --git a/src/mailbox_1.c b/src/mailbox_1.c
index ec9f0883e..e42d7d45d 100644
--- a/src/mailbox_1.c
+++ b/src/mailbox_1.c
@@ -5,6 +5,7 @@
 #include "input.h"
 #include "mailbox.h"
 #include "wonder_mail.h"
+#include "menu_input.h"
 
 extern struct unkStruct_203B304 *gUnknown_203B304;
 
@@ -12,7 +13,6 @@ extern u8 gMailAccepted[];
 extern u8 gUnknown_80E0324[];
 
 extern void xxx_call_draw_string(s32 x, u32 y, u8 *, u32 , u32);
-extern void sub_8012BC4(u32 x, u32 y, u32, u32, u32, u32);
 extern void sub_8008C54(u32);
 extern void sub_80073B8(u32);
 extern void sub_80073E0(u32);
@@ -27,8 +27,6 @@ extern u32 sub_802DEE0(void);
 extern void sub_802DF24(void);
 extern struct WonderMail *GetMailboxSlotInfo(u8);
 extern u8 HasNoMailinMailbox(void);
-extern u8 sub_8012FD8(u32 *);
-extern void sub_8013114(u32 *, s32 *);
 extern u32 sub_802BDEC(u32);
 extern void sub_8096A78(struct WonderMail *);
 extern void sub_8096C80(void);
@@ -42,7 +40,6 @@ extern void sub_802BEDC(void);
 extern u8 sub_802BE74(void);
 extern u8 HasNoAcceptedJobs(void);
 extern u8 HasNoPKMNNews(void);
-extern void sub_8012EA4(u32 *, u32);
 
 void HandleMailboxMenu(void)
 {
diff --git a/src/main_menu.c b/src/main_menu.c
index 03ea15cb5..1936d64a2 100644
--- a/src/main_menu.c
+++ b/src/main_menu.c
@@ -638,7 +638,7 @@ SetMenuItems(struct MenuStruct *param_1, struct UnkTextStruct2 *unkData, s32 ind
   else {
        sub_8012E04(&param_1[index],menuItems,0,0,0,index);
   }
-  param_1[index].unk4C = 1;
+  param_1[index].unk4C = TRUE;
 }
 
 void sub_8035CC0(struct UnkTextStruct2 *dataArray, u32 index)
@@ -649,7 +649,7 @@ void sub_8035CC0(struct UnkTextStruct2 *dataArray, u32 index)
     sub_800641C(dataArray, 1, 1);
 }
 
-void sub_8035CF4(struct MenuStruct * Menu, u32 index, u8 r2)
+void sub_8035CF4(struct MenuStruct * Menu, u32 index, bool8 r2)
  {
     Menu[index].unk4C = r2;
     Menu[index].unk4D = 1;
@@ -881,7 +881,7 @@ u32 UpdateMainMenu(void)
 bool8 SetMainMenuText(void)
 {
   u32 menuChoice;
-  struct MenuItem *preload;
+  const struct MenuItem *preload;
 
  // Have to load the pointer before the index
   preload = gUnknown_203B34C->unk4[0].menuItems;
diff --git a/src/makuhita_dojo_1.c b/src/makuhita_dojo_1.c
index 290857ba8..4be0926a8 100644
--- a/src/makuhita_dojo_1.c
+++ b/src/makuhita_dojo_1.c
@@ -9,6 +9,7 @@
 #include "text.h"
 #include "menu.h"
 #include "makuhita_dojo.h"
+#include "menu_input.h"
 
 struct unkStruct_203B31C
 {
@@ -66,7 +67,6 @@ extern void sub_8008C54(u32);
 extern void sub_80073B8(u32);
 extern void sub_80073E0(u32);
 extern void xxx_call_draw_string(s32 x, u32 y, const u8 *, u32 , u32);
-extern void sub_8012BC4(u32 x, u32 y, u32, u32, u32, u32);
 extern u8 sub_80A2740(s32 r0);
 extern s16 sub_80A2668(u32 r0);
 extern s32 sub_8013800(void *, u32);
@@ -81,7 +81,6 @@ extern u8 sub_80138B8(void *, u32);
 extern void PlayMenuSoundEffect(u32);
 extern s32 GetKeyPress(void *);
 extern void sub_8013660(void *);
-extern void sub_8012D08(void *, u32);
 extern void sub_8013818(void *, u32, u32, u32);
 extern void sub_803053C(void);
 extern u8 sub_80306A4(void);
diff --git a/src/menu_input.c b/src/menu_input.c
index 77fe1018b..0171b66aa 100644
--- a/src/menu_input.c
+++ b/src/menu_input.c
@@ -5,6 +5,7 @@
 #include "text.h"
 #include "util.h"
 #include "code_800D090.h"
+#include "menu_input.h"
 
 struct unkChar
 {
@@ -36,7 +37,6 @@ struct unkChar *GetCharacter(u32);
 extern void xxx_call_draw_char(u32, u32, u32, u32, u32);
 
 const u32 gDefaultMenuTextColors[] = { COLOR_WHITE_2, COLOR_RED, COLOR_RED };
-void sub_8012D08(struct UnkTextStruct2 *, s32);
 
 void sub_8012BC4(u32 x, u32 y, s32 n, s32 len, u32 param_5, u32 param_6)
 {
@@ -71,7 +71,7 @@ void sub_8012BC4(u32 x, u32 y, s32 n, s32 len, u32 param_5, u32 param_6)
     do {
       iVar1 = *piVar4;
       piVar4++;
-      uVar2 = ReturnIntFromChar2(iVar1 + 0x30U);
+      uVar2 = ReturnIntFromChar2(iVar1 + 0x30);
       iVar3 = GetCharacter(uVar2);
       total_x += iVar3->unk6;
       xxx_call_draw_char(x - total_x,y,uVar2,param_5,param_6);
@@ -100,7 +100,7 @@ void sub_8012C60(u32 x,u32 y,u32 param_3,u32 param_4,u32 param_5)
   xxx_call_draw_char(x + add_x,y,uVar2,param_4,param_5);
 }
 
-void sub_8012CAC(struct UnkTextStruct2 *param_1, struct MenuItem *param_2)
+void sub_8012CAC(struct UnkTextStruct2 *param_1, const struct MenuItem *param_2)
 {
   s16 length;
   int r5;
@@ -192,7 +192,7 @@ void sub_8012D34(struct UnkTextStruct2 *param_1, s32 param_2)
 	"\tbx r0");
 }
 
-void sub_8012D60(struct MenuStruct *param_1,struct MenuItem *menuItems,u32 *colorArray,u16 *param_4,s32 param_5,
+void sub_8012D60(struct MenuStruct *param_1,const struct MenuItem *menuItems,u32 *colorArray,u16 *param_4,s32 param_5,
                 s32 index)
 {
   const u8 *textPtr;
@@ -231,18 +231,18 @@ void sub_8012D60(struct MenuStruct *param_1,struct MenuItem *menuItems,u32 *colo
   sub_8013134(&param_1->unk14,counter,index);
   param_1->menuIndex = menuIndex;
   sub_80137B0(&param_1->unk14,0);
-  param_1->unk4C = 1;
-  param_1->unk4D = 1;
-  param_1->unk4E = 1;
+  param_1->unk4C = TRUE;
+  param_1->unk4D = TRUE;
+  param_1->unk4E = TRUE;
   param_1->menuAction = -1;
 }
 
-void sub_8012E04(struct MenuStruct *param_1,struct MenuItem *menuItems,u32 *colorArray,u16 *param_4,s32 param_5,
+void sub_8012E04(struct MenuStruct *param_1,const struct MenuItem *menuItems,u32 *colorArray,u16 *param_4,s32 param_5,
                 s32 index)
 {
   const u8 *textPtr;
   s32 counter;
-  struct MenuItem *menuItemPtr;
+  const struct MenuItem *menuItemPtr;
   s32 iVar1;
   s32 menuIndex;
   
@@ -278,16 +278,16 @@ void sub_8012E04(struct MenuStruct *param_1,struct MenuItem *menuItems,u32 *colo
   }
   param_1->unkC = param_4;
   param_1->menuItems = menuItems;
-  param_1->unk4E = 0;
-  param_1->unk4C = 1;
-  param_1->unk4D = 1;
+  param_1->unk4E = FALSE;
+  param_1->unk4C = TRUE;
+  param_1->unk4D = TRUE;
   param_1->menuAction = -1;
 }
 
-void sub_8012EA4(struct MenuStruct *param_1, u32 r1)
+void sub_8012EA4(struct MenuStruct *param_1, bool8 r1)
 {
     param_1->unk4C = r1;
-    param_1->unk4D = 1;
+    param_1->unk4D = TRUE;
     sub_8012EBC(param_1);
 }
 
@@ -297,7 +297,7 @@ void sub_8012EBC(struct MenuStruct *param_1)
   s32 y;
   u32 color;
   const u8 *textPtr;
-  struct MenuItem *menuItemsPtr;
+  const struct MenuItem *menuItemsPtr;
   u16 *_puVar2;
   const u32 *colorArray;
   s32 counter;
@@ -307,7 +307,7 @@ void sub_8012EBC(struct MenuStruct *param_1)
   struct UnkTextStruct1 *ptr_text;
   struct UnkTextStruct2 *ptr_text2;
   
-  if (param_1->unk4D != 0) {
+  if (param_1->unk4D) {
     sub_80073B8(param_1->index);
     index = param_1->index;
     ptr_text = &gUnknown_2027370[index];
@@ -348,10 +348,10 @@ void sub_8012EBC(struct MenuStruct *param_1)
       } while (menuItemsPtr->text != NULL);
     }
     sub_80073E0(param_1->index);
-    param_1->unk4D = 0;
+    param_1->unk4D = FALSE;
   }
-  if (param_1->unk4E != 0) {
-    if (param_1->unk4C != 0) {
+  if (param_1->unk4E) {
+    if (param_1->unk4C) {
       AddMenuCursorSprite(&param_1->unk14);
     }
     else {
@@ -360,13 +360,14 @@ void sub_8012EBC(struct MenuStruct *param_1)
   }
 }
 
-u8 sub_8012FD8(struct MenuStruct *param_1) {
+u8 sub_8012FD8(struct MenuStruct *param_1)
+{
   u32 prevMenuIndex;
   s32 index;
-  struct MenuItem *item;
+  const struct MenuItem *item;
   
   prevMenuIndex = param_1->menuIndex;
-  if (param_1->unk4C != 0) {
+  if (param_1->unk4C) {
     switch(GetKeyPress(&param_1->unk14))
     {
         case INPUT_DPAD_DOWN:
@@ -388,7 +389,7 @@ u8 sub_8012FD8(struct MenuStruct *param_1) {
                ((param_1->unkC == NULL || (param_1->unkC[index] != 1)))) {
               param_1->menuAction = item->menuAction;
               ++param_1; --param_1;
-              param_1->unk4C = 0;
+              param_1->unk4C = FALSE;
               param_1->unk38 = 0;
             }
             else
@@ -405,7 +406,7 @@ u8 sub_8012FD8(struct MenuStruct *param_1) {
         case INPUT_B_BUTTON:
             if (-1 < param_1->menuItems[param_1->unk2E].menuAction) {
                 param_1->menuAction = param_1->menuItems[param_1->unk2E].menuAction;
-                param_1->unk4C = 0;
+                param_1->unk4C = FALSE;
                 PlayMenuSoundEffect(1);
             }
             break;
@@ -415,12 +416,13 @@ u8 sub_8012FD8(struct MenuStruct *param_1) {
   return param_1->unk4C;
 }
 
-u8 sub_80130A8(struct MenuStruct *param_1) {
+u8 sub_80130A8(struct MenuStruct *param_1)
+{
   s32 index;
   s32 menuAction;
-  struct MenuItem *menuItem;
+  const struct MenuItem *menuItem;
   
-  if (param_1->unk4C != 0) {
+  if (param_1->unk4C) {
 
     switch(GetKeyPress(&param_1->unk14))
     {
@@ -428,14 +430,14 @@ u8 sub_80130A8(struct MenuStruct *param_1) {
             index = sub_80137A8(&param_1->unk14);
             menuItem = &param_1->menuItems[index];
             param_1->menuAction = menuItem->menuAction;
-            param_1->unk4C = 0;
+            param_1->unk4C = FALSE;
             param_1->unk38 = 0;
             PlayMenuSoundEffect(0);
             break;
         case INPUT_B_BUTTON:
             if(menuAction = param_1->menuItems[param_1->unk2E].menuAction, -1 < menuAction) {
               param_1->menuAction = menuAction;
-              param_1->unk4C = 0;
+              param_1->unk4C = FALSE;
               PlayMenuSoundEffect(0);
             }
             break;
@@ -445,8 +447,9 @@ u8 sub_80130A8(struct MenuStruct *param_1) {
   return param_1->unk4C;
 }
 
-bool8 sub_8013114(struct MenuStruct *param_1, s32 *menuAction){
-    if(param_1->unk4C != 0){
+bool8 sub_8013114(struct MenuStruct *param_1, s32 *menuAction)
+{
+    if(param_1->unk4C){
         return TRUE;
     }
     if (menuAction != NULL){
diff --git a/src/pelipper_board_1.c b/src/pelipper_board_1.c
index 011b8c8b7..74b9d3ff8 100644
--- a/src/pelipper_board_1.c
+++ b/src/pelipper_board_1.c
@@ -7,6 +7,7 @@
 #include "text.h"
 #include "team_inventory.h"
 #include "wonder_mail.h"
+#include "menu_input.h"
 
 struct unkStruct_203B308
 {
@@ -21,8 +22,7 @@ struct unkStruct_203B308
     u8 fill51[0x64 - 0x51];
     u32 unk64;
     u32 unk68;
-    u32 unk6C;
-    u8 fill70[0xBC - 0x70];
+    struct MenuStruct unk6C;
     struct MenuItem unkBC[8];
     u16 unkFC[8];
     struct UnkTextStruct2 unk10C[4];
@@ -32,7 +32,6 @@ extern struct unkStruct_203B308 *gUnknown_203B308;
 extern u8 gPelipperBoard_Accepted[];
 extern u8 gPelipperStatusSlash[];
 extern void xxx_call_draw_string(s32 x, u32 y, u8 *, u32 , u32);
-extern void sub_8012BC4(u32 x, u32 y, u32, u32, u32, u32);
 extern void sub_8008C54(u32);
 extern void sub_80073B8(u32);
 extern void sub_80073E0(u32);
@@ -48,14 +47,11 @@ extern void sub_8096A78(struct WonderMail*);
 extern void ResetPelipperBoardSlot(u8);
 extern void sub_80965F4(void);
 extern void sub_802C2D4(void);
-extern u8 sub_8012FD8(u32 *);
-extern void sub_8013114(u32 *, s32 *);
 extern u32 sub_802C1E4(u32);
 extern void PlaySound(u32);
 extern void SetPelipperBoardState(u32);
 extern u8 sub_802C26C(void);
 extern u8 HasNoAcceptedJobs(void);
-extern void sub_8012EA4(u32 *, u32);
 
 void sub_802ECB4(void)
 {
diff --git a/src/wonder_mail_2.c b/src/wonder_mail_2.c
index 6f4ed2bb3..4c4b40e07 100644
--- a/src/wonder_mail_2.c
+++ b/src/wonder_mail_2.c
@@ -13,6 +13,7 @@
 #include "wonder_mail.h"
 #include "code_800D090.h"
 #include "code_8094F88.h"
+#include "menu_input.h"
 
 struct unkStruct_203B2C8
 {
@@ -155,7 +156,6 @@ extern void sub_80073B8(u32);
 extern void sub_802BC7C(void);
 extern void sub_80073E0(u32);
 extern void xxx_call_draw_string(s32 x, u32 y, const u8 *, u32 , u32);
-extern void sub_8012BC4(u32 x, u32 y, u32, u32, u32, u32);
 extern void xxx_format_and_draw(u32, u32, const u8 *, u32, u32);
 extern void sub_803B6B0(u32, u32, u32, u32);
 extern s32 sub_8013800(u32 *, s32);
@@ -166,7 +166,6 @@ extern void sub_801317C(u32 *);
 extern u8 HasNoMailinMailbox(void);
 extern void sub_802BF30(void);
 extern void CreateMailMenu(void);
-extern void sub_8012D34(struct UnkTextStruct2 *, u32);
 extern s32 CountEmptyMailSlots(void);
 extern void sub_8013848(u32 *, s32, u32, u32);
 
diff --git a/src/wonder_mail_2_1.c b/src/wonder_mail_2_1.c
index 1a55c3e46..70664e93b 100644
--- a/src/wonder_mail_2_1.c
+++ b/src/wonder_mail_2_1.c
@@ -5,6 +5,7 @@
 #include "text.h"
 #include "menu.h"
 #include "code_802C39C.h"
+#include "menu_input.h"
 
 struct unkStruct_203B2E8
 {
@@ -37,8 +38,8 @@ struct unkStruct_203B2F0
     u32 unk10;
     u8 fill14[0x68 - 0x14];
     u32 unk68;
-    u8 fill6C[0xBC - 0x6C];
-    u8 unkBC[0x10C - 0xBC];
+    struct MenuStruct unk6C;
+    struct MenuStruct unkBC;
     struct MenuItem unk10C[8];
     struct MenuItem unk14C[8];
     u8 fill18C[0x19C - 0x18C];
@@ -131,7 +132,6 @@ const struct UnkTextStruct2 gUnknown_80DFDA4 =
 const u8 gUnknown_80DFDBC[] = "RESCUE EVENT";
 static const u8 wonder_mail_fill1[] = "pksdir0";
 
-extern void sub_8012CAC(struct UnkTextStruct2 *, struct MenuItem *);
 extern void sub_802CAA4(void);
 extern u8 IsJobSlotEmpty(u8);
 extern void sub_8008C54(u32);
@@ -142,7 +142,6 @@ extern struct WonderMail* GetJobSlotInfo(u8);
 extern s32 sub_8013800(void *, u32);
 extern void sub_803B35C(void *, u32 *);
 extern void xxx_call_draw_string(u32, u32, const u8 *, u32, u32);
-extern void sub_8012BC4(u32 x, u32 y, u32, u32, u32, u32);
 extern void CreateRescueTitle(void *);
 
 extern void sub_8013984(u32 *);
@@ -154,7 +153,6 @@ extern s32 GetKeyPress(void *);
 extern void PlayMenuSoundEffect(u32);
 extern void sub_8013660(void *);
 extern void sub_8013848(u32 *, s32, u32, u32);
-extern void sub_8012D34(struct UnkTextStruct2 *, u32);
 extern bool8 IsPelipperBoardSlotEmpty(u8);
 extern void sub_802C910(u32);
 extern void sub_802CC00(void);
@@ -163,9 +161,7 @@ extern void sub_802CD38(void);
 extern void sub_802CDB8(void);
 extern void sub_802C928(void);
 extern void sub_802C9D8(void);
-extern void sub_8012D60(u8 *, struct MenuItem *, u32, u16 *, u32, u32);
 extern void sub_802DE84(u32 *);
-extern void sub_8012EA4(u8 *, u32);
 extern void sub_802CBAC(void);
 
 s32 CountAcceptedJobs(void);
@@ -499,13 +495,13 @@ void sub_802C9D8(void)
             break;
         case 2:
             sub_802C750();
-            sub_8012D60(gUnknown_203B2F0->fill6C, gUnknown_203B2F0->unk10C, 0, 0, gUnknown_203B2F0->unk68, 2);
+            sub_8012D60(&gUnknown_203B2F0->unk6C, gUnknown_203B2F0->unk10C, 0, 0, gUnknown_203B2F0->unk68, 2);
             break;
         case 3:
             sub_802CBAC();
             sub_802C750();
-            sub_8012EA4(gUnknown_203B2F0->fill6C, 0);
-            sub_8012D60(gUnknown_203B2F0->unkBC, gUnknown_203B2F0->unk14C, 0, 0, 6, 3);
+            sub_8012EA4(&gUnknown_203B2F0->unk6C, 0);
+            sub_8012D60(&gUnknown_203B2F0->unkBC, gUnknown_203B2F0->unk14C, 0, 0, 6, 3);
             break;
         case 4:
             sub_803B35C(GetJobSlotInfo(gUnknown_203B2F0->unkC), &gUnknown_203B2F0->unk10);
diff --git a/src/wonder_mail_2_mid.c b/src/wonder_mail_2_mid.c
index 8b15dd368..8f4db0157 100644
--- a/src/wonder_mail_2_mid.c
+++ b/src/wonder_mail_2_mid.c
@@ -8,12 +8,12 @@
 #include "pokemon_mail.h"
 #include "wonder_mail.h"
 #include "code_802C39C.h"
+#include "menu_input.h" 
 
 bool8 IsMailSlotEmpty(u8);
 extern void sub_8013984(void *);
 extern void sub_8013848(u32 *, s32, u32, u32);
 extern s32 sub_802C474(void);
-extern void sub_8012D34(struct UnkTextStruct2 *, u32);
 extern void sub_802C328(void);
 extern void sub_802C39C(void);
 extern void PlayMenuSoundEffect(u32);
@@ -33,7 +33,6 @@ extern u8 gBulletinBoardText[];
 extern bool8 IsMailinJobSlot(struct WonderMail *);
 extern void CreateRescueTitle(void *);
 extern void xxx_call_draw_string(s32, s32, u8 *, s32, s32);
-extern void sub_8012BC4(s32, s32, s32, s32 ,s32 ,s32);
 
 
 struct unkStruct_203B2D8
diff --git a/src/wonder_mail_3.c b/src/wonder_mail_3.c
index 4c3df9c21..f6e97b5e8 100644
--- a/src/wonder_mail_3.c
+++ b/src/wonder_mail_3.c
@@ -8,6 +8,7 @@
 #include "wonder_mail.h"
 #include "wonder_mail_3.h"
 #include "code_802C39C.h"
+#include "menu_input.h"
 
 const struct UnkTextStruct2 gUnknown_80DFDD4 =
 {
@@ -104,7 +105,6 @@ ALIGNED(4) const u8 gUnknown_80E014C[] = "New Mail";
 ALIGNED(4) const u8 gUnknown_80E0158[] = "Old Mail";
 static const u8 wonder_mail_3_fill[] = "pksdir0";
 
-extern void sub_8012CAC(struct UnkTextStruct2 *, struct MenuItem *);
 extern void sub_802D63C(void);
 extern void sub_802D5A4(void);
 
@@ -131,7 +131,6 @@ extern u8 *sub_8096DD8(void);
 extern u8 sub_8096C08(u8 *);
 extern void sub_802C750(void);
 extern void sub_802D1A0(u32);
-extern void sub_8012EA4(u8 *, u32);
 extern struct WonderMail* GetJobSlotInfo(u8);
 extern void sub_803B35C(void *, u32*);
 extern void sub_802DE84(u32 *);
@@ -143,13 +142,11 @@ extern void sub_802D690(void);
 extern void sub_8096C80(void);
 extern void sub_8096D24(void);
 extern void sub_80141B4(const u8 *, u32, u32, u32);
-extern void sub_8012D60(u8 *, struct MenuItem *, u32, u16 *, u32, u32);
 extern u8 *sub_8096DE8(void);
 extern void sub_8096A78(struct unkSubStruct_203B2F8 *);
 extern void sub_8014248(const char *text, u32, u32, struct MenuItem *r0, u32, u32, u32, u32, u32);
 struct unkStruct_803B344 *sub_803B344(u8);
 extern void xxx_call_draw_string(u32, u32, const u8 *, u32, u32);
-extern void sub_8012BC4(u32 x, u32 y, u32, u32, u32, u32);
 extern void sub_8008C54(u32);
 extern void sub_80073B8(u32);
 extern void sub_80073E0(u32);
@@ -391,13 +388,13 @@ void sub_802D2A8(void)
         break;
       case 0xd:
         sub_802C750();
-        sub_8012D60(gUnknown_203B2F8->unk78,gUnknown_203B2F8->unk118,0,gUnknown_203B2F8->unk198,
+        sub_8012D60(&gUnknown_203B2F8->unk78,gUnknown_203B2F8->unk118,0,gUnknown_203B2F8->unk198,
                     gUnknown_203B2F8->unk6C,2);
         break;
       case 0xe:
         sub_802C750();
-        sub_8012EA4(gUnknown_203B2F8->unk78,0);
-        sub_8012D60(gUnknown_203B2F8->unkC8,gUnknown_203B2F8->unk158,0,0,4,3);
+        sub_8012EA4(&gUnknown_203B2F8->unk78,0);
+        sub_8012D60(&gUnknown_203B2F8->unkC8,gUnknown_203B2F8->unk158,0,0,4,3);
         break;
       case 0xf:
         sub_803B35C(GetJobSlotInfo(gUnknown_203B2F8->jobSlotIndex),&gUnknown_203B2F8->unk14);
diff --git a/src/wonder_mail_4.c b/src/wonder_mail_4.c
index 305475f5f..d5608e381 100644
--- a/src/wonder_mail_4.c
+++ b/src/wonder_mail_4.c
@@ -7,6 +7,7 @@
 #include "code_8094F88.h"
 #include "constants/wonder_mail.h"
 #include "code_802C39C.h"
+#include "menu_input.h"
 
 struct unkStruct_203B320
 {
@@ -96,7 +97,6 @@ extern void sub_8013984(u32 *);
 extern void AddMenuCursorSprite(u32 *);
 extern s32 sub_8013800(void *, u32);
 extern void xxx_call_draw_string(u32, u32, const u8 *, u32, u32);
-extern void sub_8012BC4(u32 x, u32 y, u32, u32, u32, u32);
 extern void sub_8008C54(u32);
 extern void sub_80073B8(u32);
 extern void sub_80073E0(u32);
diff --git a/src/wonder_mail_6.c b/src/wonder_mail_6.c
index 0768ea868..65db98e1e 100644
--- a/src/wonder_mail_6.c
+++ b/src/wonder_mail_6.c
@@ -6,6 +6,7 @@
 #include "pokemon.h"
 #include "menu.h"
 #include "code_8094F88.h"
+#include "menu_input.h"
 
 extern bool8 HasNoWonderMailType(u32);
 
@@ -14,10 +15,8 @@ struct unkStruct_203B328
     // size: 0x11C
     u32 state;
     u8 mailIndex;
-    u32 unk8;
-    u8 fillC[0x58 - 0xC];
-    u32 unk58;
-    u8 fill5C[0xA8 - 0x5C];
+    struct MenuStruct unk8;
+    struct MenuStruct unk58;
     struct UnkTextStruct2 unkA8[4];
     /* 0x108 */ struct OpenedFile *faceFile;
     /* 0x10C */ u8 *faceData;
@@ -79,7 +78,6 @@ ALIGNED(4) const u8 gUnknown_80E0A0C[] = _(
         "You don{APOSTROPHE}t have any {COLOR_1 LIGHT_BLUE_2}A-OK Mail{END_COLOR_TEXT_1}.");
 const u8 wonder_mail_6_fill[] = "pksdir0";
 
-extern void sub_8012CAC(struct UnkTextStruct2 *, const struct MenuItem *);
 extern void sub_80306A8(s32, u32, u32, u32);
 extern void sub_80141B4(const char *r0, u32, struct OpenedFile **r1, u32);
 extern void sub_8031300(void);
@@ -97,10 +95,6 @@ extern void sub_8030DE4();
 extern void sub_8030810(u32);
 extern void sub_803092C(void);
 extern void sub_8030D40(u8, u32);
-extern void sub_8012EA4(u32 *, u32);
-extern void sub_8012D60(u32 *, const struct MenuItem *, u32, u32, u32, u32);
-extern u8 sub_8012FD8(u32 *);
-extern void sub_8013114(u32 *, s32 *);
 extern void sub_8095240(u8);
 
 bool8 sub_8030F58(u32 wonderMailType)
diff --git a/src/wonder_mail_802DF88.c b/src/wonder_mail_802DF88.c
index 35ecb8e56..1e201dedc 100644
--- a/src/wonder_mail_802DF88.c
+++ b/src/wonder_mail_802DF88.c
@@ -9,6 +9,7 @@
 #include "wonder_mail.h"
 #include "wonder_mail_3.h"
 #include "code_80958E8.h"
+#include "menu_input.h"
 
 struct unkStruct_203B2FC
 {
@@ -123,8 +124,6 @@ struct WonderMail *GetJobSlotInfo(u8);
 extern void sub_8096AF8(u8 *, u32, u32);
 extern void sub_8096EEC(void);
 extern void sub_803C21C(struct WonderMail *, u32 *);
-extern u8 sub_8012FD8(u8 *);
-extern void sub_8013114(u8 *r0, s32 *r1);
 extern u32 sub_802C598(s32);
 extern void sub_802C688(void);
 extern void sub_8096C80(void);
@@ -227,7 +226,7 @@ void sub_802D940(void)
   
   menuAction = 0;
   sub_802C598(0);
-  if ((sub_8012FD8(gUnknown_203B2F8->unk78) == 0) && (sub_8013114(gUnknown_203B2F8->unk78,&menuAction), menuAction != 1)) {
+  if ((sub_8012FD8(&gUnknown_203B2F8->unk78) == 0) && (sub_8013114(&gUnknown_203B2F8->unk78,&menuAction), menuAction != 1)) {
     gUnknown_203B2F8->unk6C = menuAction;
   }
 
@@ -258,9 +257,9 @@ void sub_802D9F0(void)
   
   menuAction = 0;
   sub_802C598(0);
-  sub_8012FD8(gUnknown_203B2F8->unk78);
-  if (sub_8012FD8(gUnknown_203B2F8->unkC8) == 0) {
-    sub_8013114(gUnknown_203B2F8->unkC8,&menuAction);
+  sub_8012FD8(&gUnknown_203B2F8->unk78);
+  if (sub_8012FD8(&gUnknown_203B2F8->unkC8) == 0) {
+    sub_8013114(&gUnknown_203B2F8->unkC8,&menuAction);
   }
 
   switch(menuAction)