I've been on xat for a while now and I think lots of people who are geared towards anime are also fans of Code Geass. This doesn't have to be an elaborate power; the most obvious emote would be Lelouch's eye as an animation when he uses it. Also, you could have the Brittanian flag, a Zero mask (maybe on your pawn?), Knightmare keys, perhaps the knightmares themselves, chess pieces, etc. More could be added, I'm just listing some things off of the top of my head.
Comment below and list more ideas.
~Suzaku (Tamiyami)