hm.. not sure which I want to make my person lol hm.. I already have his power in back of my head. hm.. well mostly lol, now after thinking a few second now my mind is fighting me -_- hm... maybe i'll make 1 student and 1 demon, if you don't have any rules against multiple characters lol.

The Geeky Student who would gain the power to bring types of games to life. (from video games to card games). Which with you saying 'this can evolve as time progresses or you make more contracts' I could progress with his power starting with card games and evolving into including video games.

Then the demon... who's own ability being a crazy version of shape shifting where they don't just turn into creatures/other people, also turn into inanimate objects. (such turning it's arm into a blade).

If you don't have a problem with these i'll have some CS for both up in a bit, just stating what ideas I had first so don't go making a CS that doesn't work.