I really like the idea of using a "trickster" theme to his powers. It's a nice way to bunch them up and keep them relevant to each other.

Here's a thought: why would you want to bring him from an earlier canonpoint, where he would be less active and involved, rather than a later one? It seems the biggest difference between the two would be his activity levels, and perhaps some of his mindset on the setting? What do you think would make him the most flexible?