Kei Yosugara is one of the main protagonists, apart from Aldred van Envlio. He is a human who joins the Millenium school at the start of the story. He holds within him the Holy Lance, which only Aldred can wield.
Kei is a slim, young human boy. Although he seems to be around Aldred's age, he is quite short compared to most of the characters. He has white hair with long bangs that frame his face and large purple eyes. He wears the school uniform and a long beaded necklace with a cross on the end. He has two piercings on each of his ears, and wears two square shaped studs in his left ear and two hoop earrings in his right ear.
He later is confined to a wheelchair, due to damage to his body from Aldred wield the lance.