New champ idea and could use some help

Ok so this is an incomplete idea, as I don't know much about the lore of most of the champions and I am not sure where this would fit in. I had this crazy idea of a new champion that could potentially change the way the game is played and how champions are chosen. I was watching a ranked match and Udyr was just running away with it. I started thinking about a champion that could rival him, seeing as how most champs have an opposite of sorts. The idea centered around a champion with the same concept as Udyr, but instead of turning into different "animals", what if the champion mimicked other champions? What if this champ could morph into other champs and use their abilities? What if when he killed an enemy champ, he could absorb their essence and choose which ability to use and make his/her own and evolve it so it becomes unique to this particular champ? The more I think about it the crazier it gets. Just wanted to see if anyone else has had a thought along these lines. Please comment with ideas. Id just like to see what this champ could do.