Shusui Hayasaka  

, 早坂秋水

Shusui is Oukas twin brother. He is younger than his sister. Despite being referred to as homunculi in some contexts, it's important to note that he and his sister are not actually homunculi. After LXE falls, Shusui becomes an Alchemy Warrior like his older sibling. In terms of intelligence, Shusui is highly skilled in Kendo at Ginsei High, earning him the title of vice president of the Student Council. Additionally, as Kazuki and others attest to, he has a reputation for being exceptionally well-endowed in the genitalia department. In the anime, Shusui was enlisted by Chitose to be part of the team tasked with eliminating Victor. However, despite their best efforts, this mission proved unsuccessful and they were ultimately forced to withdraw.