Asuka Tenjouin Friends

The head professor of the Slifer Red dormitory at Duel Academy. It is revealed that Daitokuji was a member of the Seven Stars Assassins and responsible for numerous events meant to orchestrate the revival of the Three Phantom Demons.

Duel Academys head nurse and gym instructor. She is also the supervisor of the female Obelisk Blue dormitory.

Asuka's older brother who disappeared earlier in the series after going to the abandoned dorm for a exam. He came back possessed by Darkness and was the first of the Seven Star Assassins to challenge Judai.

Jaden Yuki is the main character of Yu-Gi-Oh GX. Enrolled in the Duel Monsters Academy Island.

A duelist from North Academy. Known for having the deck which contains the gem beasts.

An underage student who transfers to Duel Academy in the first season in order to get near Ryo Marufuji. Two seasons later Rei returns and becomes a full time student in Duel Academy and the only girl in the Slifer Dorm.

Sho Marufuji's older brother who is a part of Obelisk Blue.

Ryo Marufuji's younger brother and best friend of Judai Yuki. Although he seems timid and unsure of himself, he has much potential to be a great duelist.