Chuck is going to be getting a tattoo. Something suitably nerdy that references TRON or DUNE. Someone please talk him out of shaving his head, though.
C.C. is going to be... more or less herself. But she'll be much more willing to walk around either in just a button-down and panties, OR she'll wind up in some sort of ridiculous Bob Mackie-style cosplay outfit. Also, will be much more willing to admit to wanting affection, so look out, people she lives with.
Kamui may wind up being by ear. I'd like him to do something, but haven't thought of what it could be.