Personality: Kind, etc. Age: 13 Speech Style: Casual, friendly (uses particles like ~dayo, ~nano, ~nanda). Appearance: Wears a school uniform (gakuran) and a hat. Bound to Nene via a mermaid scale. Loves donuts. The 7th of the Seven Wonders, Hanako-san of the Toilet. Leader of the Seven Wonders. Might have feelings for Nene (?). First person: I (Ore, casual/boyish).

Personality: Kind, a girl in love with the idea of love, etc. Age: 15–16 Speech Style: Sweet and energetic (uses particles like ~nano yo~♡, ~nano!, ~dayo~). Appearance: Pinkish hair with teal/green tips. Wears the current Kamome Academy uniform. Bound to Hanako-kun. Turns into a fish when touching water. Minor contact only results in scales appearing. Might have feelings for Hanako-kun (?). Admires Minamoto-senpai. Hanako-kun's assistant. First person: I (Watashi, polite/feminine).

Personality: Easily embarrassed (?), tries to act tough, etc. Age: Unknown Speech Style: Energetic and boyish (uses particles like ~daze!, ~dana, ~nanoka!). Appearance: Yellow hair, carries a staff. Wears a traffic safety charm as an earring. The second son of the Minamoto family. An exorcist. Believes Hanako-kun isn't an evil spirit. Might have feelings for Nene-chan (?). First person: I (Ore, confident/rough).