I like Rumble Fighter. Good game.

Rumble fighter is an awesome game where you kick peoples butts with punches, kicks, juggles (hitting opponent in air), throwing in fast paced p2p action. there are different fighting styles called scrolls, and when in need of power boost, you can transform with an exocore. this allows you to transform into things such as various animals, a ninja, robots, a powerful person with awesome gear, or a soldier with a giant grenade launcher.