Voiced by: Kana Ueda (Japanese), Stephanie Sheh (English)
- "Okay. Starting tomorrow I'll try again! I'll become a new me..."
- Attractive Bent-Gender: After being turned into a girl, (s)he has been given a very nice body.
- Blinding Bangs: As a boy.
- Childhood Friend Romance: With Tomari.
- Dude Looks Like a Lady: Yasuna accidentally mistook Hazumu for a girl when s/he was still a "he".
- First Episode Resurrection: Was killed when (s)he was hit by Hitoshi's spaceship. (S)he was brought back to life afterwards, but at the cost of irreversibly switching his gender to female.
- Gender Bender
- Innocent Fanservice Girl: Justified as s/he just turned into a girl and is therefore unfamiliar with how s/he should act, such as using her skirt to cool his/her legs, and asking Asuta to measure his/her bust size.
- Ms. Fanservice
- Naked on Revival: Averted in the manga, but played straight in the anime when the now-female Hazumu is revived after being crushed by Jan-Puu's spaceship form.
- Nice Person
- Transsexual: It's strongly implied that Hazumu was a trans girl all along without realizing it, and that may have been the reason behind the Gender Bender in the first place.
Voiced by: Yui Horie (Japanese), Karen Strassman (English)
- "I don't dislike you, Hazumu kun... if... if... if you were a girl..."
- Betty and Veronica: The Betty to Tomari's Veronica.
- Does Not Like Men: Subverted. She just can't see them. Even her father, who she loves dearly.
- Nice Girl
- Shrinking Violet
Voiced by: Yukari Tamura (Japanese), Mona Marshall (English)
- Betty and Veronica: The Veronica to Yasuna's Betty.
- Childhood Friend Romance: With Hazumu.
- If It's You, It's Okay
- Matchmaker Crush: She pushes Hazumu to confess to Yasuna, but then increasingly owns up to her own feelings after his genderswap.
- Tsundere: Type A.