Bowser Jr. is a recurring antagonist character in the Mario franchise, designed to be a rival of the eponymous character. He is Bowser's only son, King Koopa.
He first appeared in Super Mario Sunshine where he pretends to be Mario with the goal of kidnapping Princess Peach. He then appears in many other games following in his father's footsteps, doing everything possible to help him conquer the Mushroom Kingdom.
He never appears without his characteristic white scarf, on which 8 fangs are drawn to imitate those of his father, since his own have not yet come out due to his young age. He also takes his father as a model and does everything possible to make him proud.
Hyperactive and mischievous by nature, he is a little troublemaker who does not hesitate to use cunning to achieve his ends.