Tadachika Ookubo, also known by her other Nagayasu Ookubo (大久保 忠隣 / 大久保 永易) is a rare person who inherited two names and is a second year Representative Committee Chairman of Ariadust Academy.
Appearance
She wears glasses and carries around two swords with her at all times.
Personality She seems to be one of the rare 'normal' people aboard Mushashi as she comments on her upperclassmen and tries to find a common ground with any of them but fails with anyone she sees.