Humans actually have one of the highest potential in combat they can actually gain powers through many things. It actually take effort to not be strong.

Turbo Mode: It a alter ego of the user who more edgy but brutally strong by 100x as you gains new abilities but you can't use them in your normal state. Half humans aren't as strong as pure blood humans

Beast Mode: Simply to the God Of Humans not everyone gains this power. This is only for pure blooded humans. Only a few humans are able to use this form and keep their sanity. It one of the strongest powers to rival deities and gods

Blackenheart_