Brron, Mad King of Dark World

Brron, Mad King of Dark World (voiced by Jamie McGonnigal) was a villain from Yu-Gi-Oh! GX that served as the leader of the Dark World army. When Jaden and his friends went looking for Jesse in the alternate dimension, Brron's minions captured four of them (Chazz, Hasslebarry, Atticus, and even Alexis) and used them during his duel with Jaden. Brron used them as sacrifices to for his Wicked Canon spell card in order to create Super Polymerization. However, his plan failed, because he needed 5 offerings (Syrus was the fifth). Even with his friends gone, Jaden continued to duel in sorrow and anger. Jaden won, but the results caused him to become the Supreme King.

During the Adventure series, the memory of his duel with Brron has scarred Jaden, making him fear for his friends safety.

Trivia

 * In Jeffrey, Jaden & Friends' Storm Adventures of Rise of the Guardians, Pitch creates a copy of Brron to scare Jaden into fighting back.