It's hard to describe a complex person like Three, but if there's anything you should know it's that he's sweet and romantic. Of course he's also athletic, forgiving and precise, but they're far less prominent, especially compared to impulses of being coarse as well.
His sweet nature though, this is what he's most well-liked for. People regularly count on this and his persuasive nature especially when they need comforting or support.
Nobody's perfect of course and Three has rotten moods and days too. His self-indulgence and monstrous nature don't make for the greatest company and just affect all around negatively.
Fortunately his romantic nature helps make sure these days are few and far between.