@Destinyheroknight: Antagonist of the new Bleach movie. IIRC his best feat was casually blitzing Vaizard Ichigo and being able to create a barrier to survive a city-busting attack. His destructive feats are more or less null.
Kokotu can't die in hell, he keeps coming back no matter what. Plus add in the fact that he's a ridiculous beast who shrugged off H2 Ichigo like he was nothing, and nobody could really touch him until hell lent Ichigo powers.