"If you have other ideas for a melee or defensive set ...."
Offensive:
Nunchucks ,
Vampire attack (you pounce bite their neck and immobilize, drain health and drain endurance.)
Steal Powers (you could temperarly take a foe's powers as your own, like claws, a gun or what ever)
Shape Shifting (animals or something)
Defensive:
Possession (get inside someone and control them, they take your damage as long as they are possessed and you can use their powers too maybe),
Wall Crawling ,
stop time would be cool but not sure if that would be possible, maybe in a localized area (or maybe only used in missions)and with a very long recharge time
Just some ideas... (maybe someday. . )