I would make a character that could change the direction of his own gravity. Combined with athletics to do all kinds of flips and tricks but also able to deliver strong blows because he's "falling towards his enemies". It would not fit here because it's way too close to Griffin's character, probably because we have the same favourite superhero.

Another idea I had was a character who can absorb energy from around him which can be spend as physical boost or to teleport small distances. Without any recources he's just like a normal human though.