[quote=@silentmusician]
The centaur, however, sounds like using 2 PCs in one fight, naturally making things a 2v1. If it was a horse, it would feel more fair, but the fact it's a centaur, who has equipabble upper body with additional arms, makes that easily unbalanced from a fight standpoint.
[/quote]

The opponent would have to be more powerful or team up with someone else or it could be an event type thing, like characters fighting against small armies. It's not something arena battles typically are but possible.