- Mira Naigus (ミーラ･ナイグスMīra Naigusu?, Mila Naigus in the English anime)
- Voiced by: Junko Noda (Japanese), Shay Moore (English)
- Sid's weapon partner, taking the form of a combat knife. She is often found wrapped in bandages in her human form. She replaces Medusa as the school nurse, and also acts as aPE teacher.
Community content is available under CC-BY-SA unless otherwise noted.