Kenny actually was a superhuman. He became a Variant monster after failing his Level 2 evolution due to hitting it before he was ready. He's a bit of a weird case. Firstly because failing an evolution usually just straight up turns you into whatever monster infected you, like Claire Lantos being infected by a Banshee and then becoming one once she messed up her Level 3 evolution. Kenny, however, had a monster parent that was of a female exclusive species. Secondly, because it's left deliberately vague what the true extent of his power was, as he's noted in his character profile to have been absolute ass at actually using it, and thus never actually developed anything unique.
Despite that, he did have some divergence from his monster parent, as his oil was exclusively produced from his hands at Level 1 and as a Variant monster his oil could potentially resurrect and control hundreds of people at once.
