Shusui Hayasaka

Shusui Hayasaka (早坂秋水, Hayasaka Shusui) is Ouka's younger twin brother. Like his sister, he is depicted as very smart, but unlike his sister, is quick to anger. Shusui is Ginsei High's best student at kendo, his speciality being the notoriously difficult reverse do. He is also vice president of the student council under Ouka, and Kazuki claims he's number one in terms of genital size. His eyes are shown as fierce and maniacal at times, as noted by Dr. Butterfly and himself. After Shusui is defeated by Kazuki, he surrenders his kakugane to Captain Bravo and returns to his old kendo teacher to try and overcome his demons, and then later becomes an Alchemy Warrior. In the anime, Shusui is recruited by Chitose into the team dispatched to take out Victor. He is later seen in "Buso Renkin Period" defeating Mita in battle.

He uses Kakugane XXIII, which manifests as the Buso Renkin Sword Samurai X (ソード・サムライ・X , Sōdo Samurai X), a sword with a small charm attached to the end.[clarify] The sword absorbs energy into the charm, and the user can make this energy discharge from the charm. This energy can only be used as a short-range attack and cannot stop kinetic energy from physical attacks; as such, its strength depends on the user's skill at kendo, making this a deadly weapon in Shusui's hands. "Samurai X" refers to the English name of Rurouni Kenshin as translated by ADV, which the author stated he likes.[citation needed] Watsuki revealed he created the ability to neutralise energy because he was tired of swords firing energy beams in fighting games. Voiced by: Kishô Taniyama (Japanese), Tom Gibis (English)

Source: Wikipedia