EASY:
2D: Salvo the slime, Marching Milde, Bowser Jr.(NSMB1), Bowser(NSMB1), Larry(NSMBW)
3D: Dino Piranha, Big Bully, King Kaliente
Spinoff: Dry Bones(MPDS), Wiggler(MP9)
RPG: First Fawful(SS), Goomba King, Blooper(TTYD)
HARDEST:
2D:Wart, Baby Bowser, Bowser(SMB)
3D: Phantamanta, Bouldergeist...