Based on looks alone, I could stare at Lauren Cohan for the rest of my life.
Based on character/person,.. well, Merle Dixon!
Merle obviously had his flaws. But, considering what he was dealt in life, he wasn't an outright monster. Anyone else in his position would have gone full lunatic,.. like the governor. Merle lacks the ability to lead to get to the level that the governor got to. And, more importantly, Merle is not an evil person like the governor.
Merle was certainly bad. But, not evil. And him being bad went (mostly) away in Season 3 - which was HUGE, considering what he went through pre and post zombie breakout.
He had some sense of loyalty as well, like to his brother, to the governor and even honored truces where necessary. But, that loyalty was to a fault - following the governor being the prime example.
Furthermore, he was a true survivor. You frankly need someone like Merle in a post apocalyptic world. And, it would be best to sooth him than to have to fight him. Especially since he isn't rotten to the core. Whatever rot was there, could be cleared and cleaned via redemption (saving people, rebuilding society) - which again, we started seeing in Season 3.