diff --git a/functions.py b/functions.py
index b7862893cc..446b2fe719 100644
--- a/functions.py
+++ b/functions.py
@@ -247,11 +247,15 @@ known_funcs = {
     0x800BDFC0:("func_800BDFC0","UNK_RET","UNK_TYPE, UNK_TYPE, UNK_TYPE, s800A5AC0*"),
     0x800BE03C:("func_800BE03C","void","z_GlobalContext*, UNK_TYPE"),
     0x800C6024:("func_800C6024","UNK_TYPE","UNK_TYPE"),
+    0x800C6188:("func_800C6188","UNK_TYPE","z_GlobalContext*, UNK_PTR, z_Actor*, UNK_TYPE"),
     0x800C6248:("func_800C6248","UNK_TYPE","UNK_TYPE, UNK_TYPE"),
+    0x800C64CC:("func_800C64CC","UNK_RET","z_GlobalContext*, UNK_PTR, UNK_TYPE"),
+    0x800C9564:("func_800C9564","UNK_RET","UNK_TYPE, UNK_PTR"),
     0x800CAAD0:("func_800CAAD0","UNK_RET","UNK_TYPE, UNK_TYPE, UNK_TYPE"),
     0x800CAC0C:("func_800CAC0C","UNK_RET","UNK_TYPE, UNK_TYPE, UNK_TYPE"),
     0x800CACA0:("func_800CACA0","UNK_RET","UNK_TYPE, UNK_TYPE, UNK_TYPE"),
     0x800CAD2C:("func_800CAD2C","UNK_TYPE","UNK_TYPE, UNK_TYPE, UNK_TYPE"),
+    0x800CAE10:("func_800CAE10","UNK_RET","z_Actor*, UNK_TYPE"),
     0x800CAE88:("func_800CAE88","UNK_RET","UNK_TYPE"),
     0x800CAF24:("func_800CAF24","UNK_RET","UNK_TYPE"),
     0x800CAF38:("func_800CAF38","UNK_RET","UNK_TYPE"),
@@ -301,6 +305,7 @@ known_funcs = {
     0x80183070:("func_80183070","void","void"),
     0x8018349C:("func_8018349C","UNK_RET","UNK_TYPE, UNK_TYPE"),
     0x8019F0C8:("func_8019F0C8","UNK_RET","UNK_TYPE"),
+    0x8019FAD8:("func_8019FAD8","UNK_RET","UNK_PTR, UNK_TYPE, f32"),
 
     # ovl_En_Test
     #0x80862B70:("func_80862B70","void","void* a0"),
diff --git a/include/functions.h b/include/functions.h
index abcc2342b4..ecabcbd4ad 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -1016,13 +1016,13 @@ void func_800BE03C(z_GlobalContext*, UNK_TYPE); // func_800BE03C
 UNK_TYPE func_800C6024(UNK_TYPE); // func_800C6024
 // UNK_RET func_800C6044(UNK_ARGS);
 // UNK_RET func_800C6098(UNK_ARGS);
-// UNK_RET func_800C6188(UNK_ARGS);
+UNK_TYPE func_800C6188(z_GlobalContext*, UNK_PTR, z_Actor*, UNK_TYPE);
 UNK_TYPE func_800C6248(UNK_TYPE, UNK_TYPE); // func_800C6248
 // UNK_RET func_800C62BC(UNK_ARGS);
 // UNK_RET func_800C6314(UNK_ARGS);
 // UNK_RET func_800C636C(UNK_ARGS);
 // UNK_RET func_800C641C(UNK_ARGS);
-// UNK_RET func_800C64CC(UNK_ARGS);
+UNK_RET func_800C64CC(z_GlobalContext*, UNK_PTR, UNK_TYPE);
 // UNK_RET func_800C6554(UNK_ARGS);
 // UNK_RET func_800C656C(UNK_ARGS);
 // UNK_RET func_800C6838(UNK_ARGS);
@@ -1042,7 +1042,7 @@ UNK_TYPE func_800C6248(UNK_TYPE, UNK_TYPE); // func_800C6248
 // UNK_RET func_800C921C(UNK_ARGS);
 // UNK_RET func_800C9380(UNK_ARGS);
 // UNK_RET func_800C94E0(UNK_ARGS);
-// UNK_RET func_800C9564(UNK_ARGS);
+UNK_RET func_800C9564(UNK_TYPE, UNK_PTR);
 // UNK_RET func_800C9640(UNK_ARGS);
 // UNK_RET func_800C9694(UNK_ARGS);
 // UNK_RET func_800C9704(UNK_ARGS);
@@ -1080,7 +1080,7 @@ UNK_RET func_800CAAD0(UNK_TYPE, UNK_TYPE, UNK_TYPE); // func_800CAAD0
 UNK_RET func_800CAC0C(UNK_TYPE, UNK_TYPE, UNK_TYPE); // func_800CAC0C
 UNK_RET func_800CACA0(UNK_TYPE, UNK_TYPE, UNK_TYPE); // func_800CACA0
 UNK_TYPE func_800CAD2C(UNK_TYPE, UNK_TYPE, UNK_TYPE); // func_800CAD2C
-// UNK_RET func_800CAE10(UNK_ARGS);
+UNK_RET func_800CAE10(z_Actor*, UNK_TYPE);
 // UNK_RET func_800CAE34(UNK_ARGS);
 // UNK_RET func_800CAE7C(UNK_ARGS);
 UNK_RET func_800CAE88(UNK_TYPE); // func_800CAE88
@@ -4219,7 +4219,7 @@ UNK_RET func_8019F0C8(UNK_TYPE); // func_8019F0C8
 // UNK_RET func_8019F88C(UNK_ARGS);
 // UNK_RET func_8019F900(UNK_ARGS);
 // UNK_RET func_8019FA18(UNK_ARGS);
-// UNK_RET func_8019FAD8(UNK_ARGS);
+UNK_RET func_8019FAD8(UNK_PTR, UNK_TYPE, f32);
 // UNK_RET func_8019FB0C(UNK_ARGS);
 // UNK_RET func_8019FC20(UNK_ARGS);
 // UNK_RET func_8019FCB8(UNK_ARGS);
diff --git a/include/structs.h b/include/structs.h
index 1443aca3e6..6e2d1383bc 100644
--- a/include/structs.h
+++ b/include/structs.h
@@ -118,26 +118,31 @@ typedef void(*z_ActorFunc)(struct z_Actor*, void*);
 typedef struct {
     /* 0x000 */ u8 pad0[4];
     /* 0x004 */ UNK_TYPE unk4;
-    /* 0x008 */ u8 pad1[0x14];
+    /* 0x008 */ z_Vector3D unk8; // Pos1?
+    /* 0x014 */ u8 pad1[0x8];
     /* 0x01C */ s16 unk1C;
-    /* 0x01E */ u8 pad2[0x3A];
+    /* 0x01E */ u8 pad2[0x6];
+    /* 0x024 */ z_Vector3D unk24; // Pos2?
+    /* 0x030 */ u8 pad3[0x28];
     /* 0x058 */ z_Vector3D unk58; // scale?
-    /* 0x064 */ u8 pad3[0x2E];
+    /* 0x064 */ u8 pad4[0x2E];
     /* 0x092 */ s16 unk92;
-    /* 0x094 */ u8 pad4[0x22];
+    /* 0x094 */ u8 pad5[0x22];
     /* 0x0B6 */ u8 unkB6;
-    /* 0x0B7 */ u8 pad5[5];
+    /* 0x0B7 */ u8 pad6[5];
     /* 0x0BC */ u16 unkBC; // or char
     /* 0x0BE */ s16 unkBE;
-    /* 0x0C0 */ u8 pad6[0x3C];
+    /* 0x0C0 */ u8 pad7[0x2C];
+    /* 0x0EC */ UNK_TYPE unkEC;
+    /* 0x0F0 */ u8 pad8[0xC];
     /* 0x0FC */ f32 unkFC; // start of z_Vector3D?
     /* 0x100 */ f32 unk100;
     /* 0x104 */ f32 unk104;
-    /* 0x108 */ u8 pad7[0xE];
+    /* 0x108 */ u8 pad9[0xE];
     /* 0x116 */ u16 unk116;
-    /* 0x118 */ u8 pad8[0x24];
+    /* 0x118 */ u8 pad10[0x24];
     /* 0x13C */ z_ActorFunc drawFunc;
-    /* 0x140 */ u8 pad9[4];
+    /* 0x140 */ u8 pad11[4];
     // TODO figure out what size this is
 } z_Actor;
 
@@ -158,17 +163,19 @@ typedef struct {
 
 typedef struct {
     /* 0x00000 */ z_GraphicsContext* unk0;
-    /* 0x00004 */ u8 pad0[0x1C9C];
+    /* 0x00004 */ u8 pad0[0x87C];
+    /* 0x00880 */ UNK_TYPE unk880;
+    /* 0x00884 */ u8 pad1[0x141C];
     /* 0x01CA0 */ UNK_TYPE unk1CA0;
-    /* 0x01CA4 */ u8 pad1[0x28];
+    /* 0x01CA4 */ u8 pad2[0x28];
     /* 0x01CCC */ sGlobalContext1CCC* unk1CCC;
-    /* 0x01CD0 */ u8 pad2[0x15330];
+    /* 0x01CD0 */ u8 pad3[0x15330];
     /* 0x17000 */ u16 unk17000;
-    /* 0x17002 */ u8 pad3[0xD86];
+    /* 0x17002 */ u8 pad4[0xD86];
     /* 0x17D88 */ UNK_TYPE unk17D88;
-    /* 0x17D8C */ u8 pad4[0xAB4];
+    /* 0x17D8C */ u8 pad5[0xAB4];
     /* 0x18840 */ UNK_TYPE unk18840;
-    /* 0x18844 */ u8 pad5[0x40];
+    /* 0x18844 */ u8 pad6[0x40];
     /* 0x18884 */ UNK_TYPE unk18884;
 } z_GlobalContext;
 
diff --git a/include/variables.h b/include/variables.h
index 005993dcba..b92e5178d6 100644
--- a/include/variables.h
+++ b/include/variables.h
@@ -698,7 +698,7 @@ extern UNK_TYPE D_00C7A4E0; // D_00C7A4E0
 //extern UNK_TYPE D_060005C0;
 //extern UNK_TYPE D_060005C4;
 //extern UNK_TYPE D_060005C8;
-//extern UNK_TYPE D_060005D0;
+extern UNK_TYPE D_060005D0;
 //extern UNK_TYPE D_060005D4;
 //extern UNK_TYPE D_060005F8;
 //extern UNK_TYPE D_060005FC;
@@ -1058,7 +1058,7 @@ extern UNK_TYPE D_06001228; // D_06001228
 //extern UNK_TYPE D_06002CD0;
 //extern UNK_TYPE D_06002CE0;
 //extern UNK_TYPE D_06002D28;
-//extern UNK_TYPE D_06002D30;
+extern UNK_TYPE D_06002D30;
 //extern UNK_TYPE D_06002D84;
 //extern UNK_TYPE D_06002DD4;
 //extern UNK_TYPE D_06002DE8;
@@ -11194,7 +11194,7 @@ extern f32 D_808637D0; // D_808637D0
 //extern UNK_TYPE D_80ACA9F0;
 //extern UNK_TYPE D_80ACB140;
 //extern UNK_TYPE D_80ACB3B0;
-//extern UNK_TYPE D_80ACB650;
+extern f32 D_80ACB650;
 //extern UNK_TYPE D_80ACC2C0;
 //extern UNK_TYPE D_80ACC2EC;
 //extern UNK_TYPE D_80ACC308;
diff --git a/src/actors/ovl_Bg_Fu_Kaiten_0x80ACB400/ovl_Bg_Fu_Kaiten_0x80ACB400.c b/src/actors/ovl_Bg_Fu_Kaiten_0x80ACB400/ovl_Bg_Fu_Kaiten_0x80ACB400.c
new file mode 100644
index 0000000000..78874922b2
--- /dev/null
+++ b/src/actors/ovl_Bg_Fu_Kaiten_0x80ACB400/ovl_Bg_Fu_Kaiten_0x80ACB400.c
@@ -0,0 +1,125 @@
+#include <ultra64.h>
+#include <global.h>
+
+typedef struct z_ActorBgFuKaiten_s {
+    /* 0x000 */ z_Actor baseActor;
+    /* 0x144 */ UNK_TYPE unk144;
+    /* 0x148 */ u8 pad0[0x18];
+    /* 0x160 */ f32 unk160;
+    /* 0x164 */ f32 unk164;
+    /* 0x168 */ s16 unk168;
+    /* 0x16A */ s16 unk16A;
+    /* 0x16C */ s16 unk16C;
+    /* 0x16E */ u8 pad1[0x2];
+} z_ActorBgFuKaiten;
+
+void z_bg_fu_kaiten_init(z_ActorBgFuKaiten* this, z_GlobalContext* ctxt);
+void z_bg_fu_kaiten_fini(z_ActorBgFuKaiten* this, z_GlobalContext* ctxt);
+UNK_RET func_80ACB4B4(z_ActorBgFuKaiten* this);
+UNK_RET func_80ACB50C(z_ActorBgFuKaiten* this);
+void z_bg_fu_kaiten_main(z_ActorBgFuKaiten* this, z_GlobalContext* ctxt);
+void z_bg_fu_kaiten_draw(z_ActorBgFuKaiten* this, z_GlobalContext* ctxt);
+
+z_ActorInit bgBgFuKaitenInitVar = {
+    0x01AE,
+    1,
+    0,
+    0x30,
+    0x01A0,
+    sizeof(z_ActorBgFuKaiten),
+    (z_ActorFunc)z_bg_fu_kaiten_init,
+    (z_ActorFunc)z_bg_fu_kaiten_fini,
+    (z_ActorFunc)z_bg_fu_kaiten_main,
+    (z_ActorFunc)z_bg_fu_kaiten_draw
+};
+
+f32 D_80ACB650 = 0.002;
+
+
+// This starts with 3 NOPs, is this another section?
+GLOBAL_ASM(
+.data
+glabel D_80ACB654
+/* 000149 0x80ACB654 */ .word    0x00000000
+/* 000150 0x80ACB658 */ .word    0x00000000
+/* 000151 0x80ACB65C */ .word    0x00000000
+/* 000152 0x80ACB660 */ .word    0x00000230
+/* 000153 0x80ACB664 */ .word    0x00000020
+/* 000154 0x80ACB668 */ .word    0x00000010
+/* 000155 0x80ACB66C */ .word    0x00000000
+/* 000156 0x80ACB670 */ .word    0x00000008
+/* 000157 0x80ACB674 */ .word    0x450000D8
+/* 000158 0x80ACB678 */ .word    0x460000DC
+/* 000159 0x80ACB67C */ .word    0x44000180
+/* 000160 0x80ACB680 */ .word    0x44000188
+/* 000161 0x80ACB684 */ .word    0x82000010
+/* 000162 0x80ACB688 */ .word    0x82000014
+/* 000163 0x80ACB68C */ .word    0x82000018
+/* 000164 0x80ACB690 */ .word    0x8200001C
+/* 000165 0x80ACB694 */ .word    0x00000000
+/* 000166 0x80ACB698 */ .word    0x00000000
+/* 000167 0x80ACB69C */ .word    0x00000040
+)
+
+void z_bg_fu_kaiten_init(z_ActorBgFuKaiten* this, z_GlobalContext* ctxt) {
+    UNK_TYPE pad0;
+    UNK_TYPE pad1;
+    UNK_TYPE sp24 = 0;
+
+    func_800B67E0((z_Actor*)this, 1.0);
+    func_800CAE10((z_Actor*)this, 3);
+    func_800C9564((UNK_TYPE)&D_06002D30, &sp24); // XXX: D_06002D30 is probably a constant
+    this->unk144 = func_800C6188(ctxt, &ctxt->unk880, (z_Actor*)this, sp24);
+
+    this->unk164 = 0.0;
+    this->unk168 = 0;
+    this->unk16A = 0;
+    this->unk16C = 0;
+}
+
+void z_bg_fu_kaiten_fini(z_ActorBgFuKaiten* this, z_GlobalContext* ctxt) {
+    func_800C64CC(ctxt, &ctxt->unk880, this->unk144);
+}
+
+UNK_RET func_80ACB4B4(z_ActorBgFuKaiten* this) {
+    s16 v0 = this->unk168;
+    f32 f0;
+    this->baseActor.unkBE += v0;
+    if (v0 > 0)
+    {
+        f0 = (f32)v0 * D_80ACB650;
+        func_8019FAD8(&this->baseActor.unkEC, 8310, f0);
+    }
+}
+
+UNK_RET func_80ACB50C(z_ActorBgFuKaiten* this) {
+    this->unk16C += this->unk16A;
+    this->baseActor.unk24.y = this->baseActor.unk8.y + this->unk160 + this->unk164;
+
+    this->baseActor.unk24.y -= this->unk164 * func_800FED44(this->unk16C);
+}
+
+void z_bg_fu_kaiten_main(z_ActorBgFuKaiten* this, z_GlobalContext* ctxt) {
+    func_80ACB4B4(this);
+    func_80ACB50C(this);
+}
+
+void z_bg_fu_kaiten_draw(z_ActorBgFuKaiten* this, z_GlobalContext* ctxt) {
+    z_GraphicsContext* sp24 = ctxt->unk0;
+    UNK_TYPE pad;
+    u32* v0;
+
+    // XXX: register allocation is wrong here
+
+    func_8012C28C(sp24);
+
+    v0 = sp24->unk2B0;
+    sp24->unk2B0 += 2;
+    v0[0] = 0xDA380003;
+    v0[1] = func_80181A40(ctxt->unk0);
+
+    v0 = sp24->unk2B0;
+    sp24->unk2B0 += 2;
+    v0[1] = (u32)&D_060005D0; // XXX: D_060005D0 is probably a constant
+    v0[0] = 0xDE000000;
+}
diff --git a/variables.py b/variables.py
index 57bd54a04d..0577a48a35 100644
--- a/variables.py
+++ b/variables.py
@@ -5,8 +5,10 @@ known_vars = {
     0x00ACC000:("","UNK_TYPE",False), # this seems low
     0x00B3C000:("","UNK_TYPE",False), # this seems low
     0x00C7A4E0:("","UNK_TYPE",False), # this seems low
+    0x060005D0:("","UNK_TYPE",False), # this seems low
     0x06001100:("","UNK_TYPE",False), # this seems low
     0x06001228:("","UNK_TYPE",False), # this seems low
+    0x06002D30:("","UNK_TYPE",False), # this seems low
     0x80000300:("osTvType","UNK_TYPE",False),
     0x80000304:("osRomType","UNK_TYPE",False),
     0x80000308:("osRomBase","UNK_TYPE",False),
@@ -193,6 +195,8 @@ known_vars = {
     # En_Test
     0x808637D0:("","f32",False),
 
+    0x80ACB650:("bgBgFuKaitenInitVar","z_ActorInit",False),
+    0x80ACB650:("","f32",False),
     0x80BD55D0:("bgIkanaRayInitVar","z_ActorInit",False),
     0x80BD55F0:("","UNK_TYPE",False),
     0x80BD561C:("bgIkanaRayCompInit","z_ActorCompInitEntry",True),