Kirby's powerup image is designated by a combination of $7384 and $7388. If $7388 is non-zero, its value is increased by 0x20 and used as an index to the image tables.
$7384 has the following valid values:
01 - Yoyo
02 - Bomb
03 - Ice
04 - Sword
05 - Fire
06 - Wing
07 - Cutter
08 - Beam
09 - Fighter
0A - Mirror
0B - Wheel
0C - Ninja
0D - Stone
0E - Hammer
0F - Jet
10 - Parasol
11 - Plasma
12 - Copy
13 - Suplex
14 - Kirby (star ship)
15 - Kirby (normal)
16 - Crash
17 - Sleep
18 - Cook
19 - Paint
1A - Mike 1
1B - Mike 2
1C - Mike 3
1D - Super
1E - Ouch
1F - Mix
20 - Wheelie Rider
Unless $7388 is non-zero, any other value will turn Kirby's image white instead.
$7388 has the following values:
00 - No override (use $7384 instead)
01 - クリア ('clear' in japanese, unused)
02 - Mix
03 - Super
04 - Cannon
05 - Trolley
06 - ゴール ('goal' in Japanese, unused)
07 - Wheelie Rider
08 - Ouch!
09 - I'm HIT.
0A - Let's go
0B - 怒 ('angry' in Japanese, unused)
0C - No good!
0D - Warp star
Any other value will also turn Kirby's image white.
Partner images are determined by $7386; this value is generally pulled from the partner ID, unless $738C is set to a non-zero value, in which case it gets set to 0x15. The values are ordered as:
01 - Gim
02 - Poppy Bros.Jr.
03 - Chilly
04 - Blade Knight
05 - Burnin' Leo
06 - Birdon
07 - Sir Kibble
08 - Waddle Doo
09 - Knuckle Joe
0A - Simirror
0B - Wheelie
0C - Biospark
0D - Rocky
0E - Bonkers
0F - Capsule-J
10 - Parasol W.Dee
11 - Plasma Wisp
12 - T.A.C.
13 - Bugzzy
14 - Helper
15 - Help! (if T.A.C. steals the partner)
All other values will result in a white box.