KH in real life... Interesting concept. It'd certainly make life a little less dull, but I'd never get any studying done if I was getting annoyed by bloody heartless every ten minutes. I'd either need Sora's cell number so I could be like "If you can waste your time making fake presents then you can get these things off my property!", or else I'd have to beat them over the head with my lava lamp. Or something equally dramatic.
As for weapon, probably something like a normal sword or whatever. While playing I tend to just dive right into the chaos. XD