I'd be Cupcake Carl, everyone's favorite enforcer. He collects 10 green candies to activate his ability.
His Ability would be spraying a layer of sourtonium on the board, the sourtonium is so heavy that it would start at the top of the board and then after every turn it would drop one line until it reached the bottom. Once on the bottom it would destroy the entire row.
Before you ask, no that's not on our list of characters or powers it's just me and who I'd be. OH and he would call in Yeti to make him spray the sourtonium. I've been reading the Jelly story documents it's one heckuva story... lol
I would be a star fish called Joe and my power would activate after collecting 10 yellow candies. I would be throwing mini star fish on the board that would change the color of the candies it touches!