Ryuji feels the most brolatable to me. I thought I would hate him at first but he quickly grew on me. Even the fact that he kept some of his bad habits throughout (please stop shouting about the Phantom Thieves in public) just made him more relatable. Not everyone wraps up their character flaws in a neat little character building arc. He imporves in some ways and in others he's still a moron.

Also I don't know why this sticks out to me but there's a scene when Ryuji, MC, and Ann are all at the gym or something and Ann makes a comment about how desirable she is towards Ryuji or whatever and he just goes "No" because at that point they're just friends, you know, and it was one of the most natural conversations and reactions I'd seen in the game so I really like that scene.