Yuumi is a very hyperactive girl that is very passionate about and interested in many different things. She is very self-motivated and has a strong sense of justice. She is also a culinary genius.
- The name Yumi means "permanence" (悠) (yu) and "water" (水) (mi).
- Yumi's surname Sajima means "sand" (沙) (sa) and "island" (島) (shima/jima).
- In the Tecmo Koei's 3D fighting game, Dead or Alive 5 Last Round, the character Honoka is dressed as Yuumi Sajima in the Schoolgirls Strikers Mashup Set. For the PlayStation 4 and Xbox One versions of the game, she can transform her school uniform into a battle outfit via pressing the Taunt Button, and doing a Power Blow or a Power Launcher.
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