Dimension High School (Series)

Sphinx Paramesos

Sphinx, a failed copy of Ryuzu Meyer created by Echidna, initially served as an antagonist in a side story before becoming a major antagonist in the main storyline.

Junichi Suwabe

Yurio Mizukami

Yuri Mizukami is a primary antagonist in Yu-Gi-Oh!

Shouhei Hashimoto

Ryuusei Midorigaoka

Ryuusei Midorigaoka is a classmate of Mamoru, known for his nerdy personality and possession of various technical gadgets.

Takeo Ootsuka

Soushi Momoya

Moyu Mashima is a 16-year-old student and Lily in the Arsenal Division.

Toshiyuki Someya

Tsuyoshi Kikawada

Tetsu Kiyoda is a supporting character in Y School Heroes, a mecha-loving student at Y-Academy specializing in sports.

Takuma Zaiki