top to bottom, left to right:
BOWSER
LUIGI, MARIO
BIRDO, YOSHI
BA-BOMB, BOOMERANG BROTHER,
SPINEY, KOOPA TROOPA,
GOOMBA, BUZZY BEETLE

negative space characters on left/front:
CHAIN CHOMP
BULLET BILL

negative space characters on right/back:
​THWOMP
BOO