In Sylas' color story we get to know Happ, a young man from Dregbourne that ran away because of his magic, much like Sylas. We also get to know that his magic is some sort of black and deadly smoke manipulation. Personally, I would really like this idea of a character to be expanded more and make him an actual champion in game. It'll bring a new type of champion, since most champions who use smoke utilize it for blinding and hiding. Moreover, it'll expand Sylas' storyline, kind of like how Kayn brought a new connection to Zed.
What do you think?