Fun mobile champs?

I really want a mobile and fun champion to play, and I was thinking on Fizz or LeBlanc. I've heard LB is too hard but I'm not really sure about it, and fizz just seems a lot of fun with his E/Q/passive mobility. Please tell me other suggestions you have for these kind of champions. I was also really interested in Kennen and Renekton for top lane, they look very very solid