King Jowser



King Jowser is like King Bowser himself, but he was once a human boy named Justin Roseman, who lived in a city called Umi City, the capital city of the Republic of Mathematica, but he hated everything that's related to numbers and math, but he also hated the heroes of the city, which are known as Team Umizoomi, the most.

One day, he was out alone in the forest and found a magic wand. Once he touches it, a wizard named Kamak came out, and he was trapped in his wand for years. Soon, he rewards Justin with one wish that he would become a powerful villain to rule Umi City and turn it into his own city (Jowser City), then Kamak used his magic wand onto Justin, and turns him into a monstrous villain, which is when King Jowser was born.

He has the power to switch his human form to a beast form (or a Koopa form). His objective is to rule over Umi City. His enemies are Team Umizoomi, but his worst enemy is Su Ji-Hoon.