Bowser Jr.

Prince Bowser Koopa Junior, typically referred to as Bowser Jr., is the only son of Bowser and therefore heir to the throne of the Koopa Kingdom. Despite his young age, Bowser Junior frequently aids his father by leading his forces and fighting Mario.

Physical Appearance
He resembles his father’s younger self very closely, with the most notable distiction between Bowser Jr. and the young Bowser being Bowser Jr.’s bandana that depicts a child’s drawing of a mouth.