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Seiya Kou
He is a student at Juban High School and the lead singer of the Three Lights.
Seiya's personality was considerably lighter than his brothers Yaten Kou and Taiki Kou. He is much more childlike in his attitude, a slight prankster edge to his character, and there were brief moments when he was not thinking about his mission. He has a cheerful disposition and is more easygoing.
He likes the color red, ruby, hamburgers, P.E class, American football. He is secretly Sailor Starfighter.