Just OP (overpowered)
SMS
E-102 Gamma
Samus
DoomGuy (most badniks and bosses one shoted)
Broken in Super (or other forms)
Elfilin
Xsonic (Super or Dark)
Inazuma (Ultimate form)
Not so op but broken (with his possible lose but hard)
Skip (his can make metal from badniks and craft any powerup)
NTOPP (his forgot about crashing or watch, his can't die)
Kazuma (In Heat Mode you can just hold spin for homing on any badniks)
Guess it's all