The prince of the Koopa tribe and the main antagonist of the series. Bowser Jr. may be a child but he has the brains in his family. He's a mastermind and will do anything to stop Mario. Since he's a child he should sound like how he did in Super Mario Sunshine. Beware though, he's only going to be a child in certain episodes but he'll be an adult later on so he has to have a voice of an adult (most likely has to sound like Bowser) later in the series.