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Shuusui Hayasaka
Voice actor: Kishou Taniyama
Height: 181cm
Weight: 70kg
Birthday: May 23 (Gemini)
Blood type: A
Age: 18
Favourite colour: cobalt blue
Likes:
Ouka, green tea
Dislikes: the world that surrounds him, society, happy people
Hobby: playing wedding
Special skill: kendou
Affiliation: Class 3A of Ginsei Private School, kendou club, LXE.
(Source: Busou Renkin #4)
Just like his sister Ouka, Shuusui is very popular among the students. He is vice president of the students' council and the star of the school's kendou club. Additionally, Shuusui is extremely handsome and gets good marks at school.
Sounds like the perfect guy, but then again, Shuusui is a member of LXE and despite everything, cares for little more than his sister, whom he feels he has to protect at any cost.
When Kazuki meets Shuusui, he thinks that he has found an akin spirit, since both boys constantly strive to become stronger so they can protect the one(s) they care for. They become regular training partners and friends, without knowing of each other's secrets.