Sūmi Masēn

Sūmi Masēn (ませーん すーみ, Masēn Sūmi) is a female Mage belonging to a Dark Guild named Faux Babylon. Being one of the founding members of said guild, Sūmi is considered to be of S-Class-level strength and holds a position roughly equivalent of it. She is a member of the team Twisted Sirens; the very backbone of Faux Babylon. Unlike most other members of the Twisted Sirens, she does not team up with anyone else when engaging others in combat, but instead teams up with her Kyoshī (僵屍, Lit. Hopping Vampire) Sheema Cobanette (コバネット シーマ, Kobanetto Shīma). Although teaming up is an overstatement; she usually only utilizes her as a living weapon.

Trivia

 * Obviously, Sūmi Masēn's name is a pun on the Japanese phrase Sumimasen (すみません), which translates to "I am sorry".