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Heheh.
I'd do all I could to make him as happy and content as possible. He'd (i presume) be reasonably durable despite his size so I'm sure petting and other kinda of physical affection would be fine. I don't know if there is anything special he would be able to do with his scaled-down aura powers or other moves but it would at least be neat to watch him fire off tiny aura spheres and zip around with extremespeed.