expressions - Is there a word for someone who is usually in the minority?

My original question was "Is there a legitimate word for 'a balancer'?" but I think it's a little hard to understand...

Let's just say there is a person, and most of the time, he is in the minority. It can be very simple, such as: he simply hates a song everybody likes (and vice versa), or he has a very long list of 'underrated movies'. I guess he has a different (if not eccentric) taste comparing to most people..

On the other hand, he often does things that most people would refuse to do, too (whether he wants to or not). For example, most people wouldn't buy damaged goods, but he would. You can say he is sacrificing himself. To his mind, "If everybody wants perfection than who will care for the damaged?" or "There are certain people who would only accept the best, so there must be people who accept the worse, coexisting with the former."

This person does things that most people would never do, he stays in the minority so other people can be in the majority => some sort of "balancer"? You know, since he balances everything.. So, is there a word for people like him?

I know this is a long shot but please help me if you can, thank you!