Kevin has the ability to absorb and manipulate energy, which initially set him as an outcast. He is often used to being seen as a freak. 

In his early life, he was a criminal surviving on the street. But he has redeemed from that, thanks to Ben and Gwen. 
Kevin is bad boy type, but he is street smart and resourceful. He is sarcastic, humourous, often makes snarky comments. He is also loyal and protective.

He still struggles with his inner demons, the reflection of his past. He has short temper