Mylo was not a bad brother

I've heard a lot of people say that they hate Mylo and that he was the reason Powder became Jinx, but they always forget that Mylo was the second youngest and stupid. He looked up to Vi, constantly wanted to impress her, and he was jealous of Powder because she got more attention than he did. He didn't hate Powder. He hated the fact that Vi never recognized him for what he did and was constantly trying to make her proud of him (ex. when he tried to show off while they were jumping across roofs in episode 1).

Mylo cared for his siblings a lot. But his constant impulse to please Vi was strong, and he thought that Powder made it harder for Vi to see and recognize him for what he was capable of.