Well, I would say Skull knight, because he's such a cool guy, and he's very very misterious.
But I wouldn't be true to myself if I said that, so it'll be Guts. He was found under his mother's corpse, thought to be a corpse himself, but he was alive. He was sold by his adoptive father to that fat pig, he didn't mean to, but killed Gambino and everybody misunderstood the act, so he had to run away. In doing so, he was shot with an arrow, nearly fell to his death, almost gotten eaten by a pack of wolves. When he finally found a place he thought he belonged to, he had to leave them only to come back and find them in the sad state that they were, finally found the love of his life, only to lose all his friends and to have his loved one raped in front of him, all the while while being able to do nothing but cut away with a broken sword at his arm that got trapped in the mouth of an apostle. When he did cut himself free, he got caught by the claw of another apostle and forced to watch the rape with the last sight of his right eye. He winessed the birth of his abomination of a son, perverted in the womb by dark forces. WOW, I mean, WOW!!
This is what made me fall madly in love with Berserk, Guts' struggle, his endless, sometimes hopeless fight. He's my favorite of all time, what happened to him made me change my entire view of the world. He transmits a message: "Stop being such a pussy, tackle your life head-on and forge your own destiny! Depression is for the weak, the strong ones fight to their last breath."