Rap battle ideas...

So I'm stumped again on who to use. Though I have a couple battles in mind, I had two ideas for new ones but need suggestions. Here's what I've got:

A character from Anime. (Most likely either SnK or SAO or both)
A character from Homestuck. (Yeah, just saw the first couple acts to it)

I know it's out of my video game realm, but maybe I could get video game characters incorporated somehow? Leave your suggestions please.