Nageki (notbullied) is a Sacrifice who is totally open to partnering up! He wouldn't actively seek anyone out, though, so someone would need to grab him and convince him that fighting is a good thing and something that he should get involved in if that's the route you want to go. It'll be easier if we have CR already because he'd be more open to going along with the idea, but I'm willing to work with whatever.

Meanwhile, there's also Chili (this account) who is a Fighter and will pretty much grab anyone who is willing whether he knows them or not. Thus proving once again that I truly play opposites. He'll even listen to the Sacrifice's orders! Since he uses primarily fire-based attacks and isn't super great with defensive tactics, though, there is a chance of getting burned.