Probably any really violent character. They're badass, sure, but they'd make the room a mess.
Also any silent characters. Link, Gordon Freeman, and Crono are awesome, but they'd be boring. Then again, with their obedience on carrying out quests, they'd be good for doing chores.
Light is a pretty cool guy, but I'd be afraid he'd kill me with his death note for being lazy.
Max (not the reaper, the one from Sam and Max) is a lovable sociopath, but he'd probably maim me several times a day. The same could be said of the other Max, however.
And for some reason I get the feeling that Chrono from Nanoha would be a bit too stiff and uptight.