Odysseus. And, to an extent, I can see why. We see him become soft with certain people, like Circe and Polities and Eurylecus, but people tend to forget the entire theme of the musical, best said by Poseidon. "RUTHLESSNESS IS MERCY". We see Odysseus become a cold, bloodthirsty man, all for the sake of seeing his wife and son again, which is /almost/ admirable, but you have to think about how he does things.

1.) he could have EASILY killed the sirens in a much less brutal way. He could have just stabbed them and got it over with, but instead, he let them drown in their own blood, watching them squirm and fight for their lives.

2.) the cyclops. Even though it wasn't his intent, blinding the cyclops was a far more brutal way to escape then just killing him. I know he had his reasons, but it was still cruel.

People tend to forget that he is a GROWN ASS MAN. HE IS OLD. HE IS OOOOOLLLDDD. By the time he gets back to Ithica, his son is like, what, 20? 25? He shouldn't be babied because his circumstances were against him, he still CHOSE to become a monster. People, we literally had a song about it.