Kagemaru 「影丸」 is the main antagonist of the first season of Yu-Gi-Oh! GX, as well as founder and former
chairman of Duel Academy.
The "Kage" portion of his name is derived from the Japanese word "kage" 「影」, meaning "shadow," while the "maru" portion means "circle" or "perfection". Therefore, this character's name could mean "shadow perfection". Another interpretation is "shadow of perfection," perhaps referring to his failed attempt at becoming immortal, or perfect. "Maru" is also a common end for male Japanese names.