Bowser

Bowser is a fat dragon-like Koopa and the quadragonist of the SMG4 series. He initially served as one of the two main antagonist of the first three seasons of the series (alongside SMG3). Over time, however, he developed a love-hate relationship with Mario and the others, often joining them in their adventures, but still sometimes appears in antagonistic roles. He is the leader and king of the Koopa Troop army. Like Toad, SMG3, Wario, and Waluigi, Bowser has seen a decrease in appearances in the ninth season, with his role as one of Mario's close friends usually filled by Fishy Boopkins and Bob, but started to return again a bit more frequently since SMG4: Super Mario Taxi.