Bowser Jr.

Bowser Jr. is a minor protagonist in Avengers: Endgame. He is Bowser's only biological son, and like his father he is a reformed ally of Thanos.

Appearance
Bowser Jr. looks very similar to a smaller version of Bowser. Bowser Jr. is a short, green reptile with a dark green spiny shell, stubby white horns, and a tuft of long red hair. He has a tan face and belly as well as yellow limbs. He wears metal rings on his wrists like Bowser, but Bowser Jr.'s rings lack spikes.

Story
Bowser Jr. is one of the heroes revived in Act III during the Final Battle. He fights alongside Bowser against various threats during the scene, and after Deku's funeral he has a heart-to-heart with Bowser.