Ace, Jack, and King are a trio of cheeky and mischievous bros who love nothing more than to mess around with each other along those weaker than them.

Ace is the youngest and smallest of the three brothers, but has the biggest attitude of the bunch. Nothing irks him more than his older bros belittling and looking down at him, and he often takes his frustrations out on those weaker than him, which makes him feel better until his big brothers come along to remind him who the runt of the family is.

King is the eldest, largest, and strongest of the bui bros, though he's usually very laidback and chill. Even then, he loves messing with his little bros and showing them who's boss, especially Ace, but he still cares about them and this is just his way of showing it.

Jack is the middle child in terms of both age and height. He's usually the most docile and seems to be the friendliest, getting along well with both of his bros but often getting bullied by both of them as well, though he usually hangs out with King and has fun putting Ace in his place alongside him.