People love heroes, obviously, but what if that hero were a monster? In my sci-fi story, I thought of taking a Devonian (not Kenthew) and painting him up to be a sympathetic, heartfelt, brave warrior who wants to help his people from the Altran slave owners. He's essentially the leader of the Devonian Resistance. Pretty swell guy, right? Well, I think after I establish that, I reveal he's really a brute who shows no mercy to any Altrans he and his group meet. He even takes Helen prisoner when she makes it clear she won't stand for his atrocities, believing her an Altran sympathizer. He has his reasons of why he's doing this, but I'm wondering: How would readers feel about this? That the person they were rooting for was actually a monster? Would they throw the book down and not read it? Keep going? Would their reaction depend on what this guy did (and will do to poor Helen when he takes her captive?) I just want to gauge it.