A girl with amazing curves, tanned skin, and blonde hair long enough to graze the ground. Due to her appearance and extremely quiet demeanor many think she is a scary person, but her personality is innocent and pure, and has the courage and will to act so she does not turn her back to unreasonable things. Actually a fan of cute things. Her talent as a Liberator is S-class. Due to her reticence, not many know of her past.

Quiet and reserved, notable for her polite way of speech. Her breasts are pretty large, but her height is basically that of a grade-school student, and that is an inferiority complex for her. Despite the quiet personality that doesn't wish to fight, she lacks luck and by meeting Mirei she gets roped into all sorts of incidents. As an Exter, she has the ability to change her body into a weapon at the hands of a Liberator. Hobby is reading. Worried about how people read her last name as "shojo (virgin girl)" (but has already half given up).

A girl transferred to mermaid before Mirei and Marimo. Half-Japanese and half-Taiwanese, she uses her small frame well and has agile movements. Speaks with the Osaka dialect, and is so cheap she will do anything for money. Personality is one that plunges head-on into everything, and her various emotions are noticeably clear. Leads a quiet life in Feste (castle), but behind the scenes runs a "jack-of-all-trades" operation, and each time someone with an ability gets transported to the island sets up bets to greedily make money.

The Governor of the Verters (guardians) that rule all ability wielders residing in the artificial castle Feste within the artificial ability-wielder quarantine island Mermaid. As the one and only male on the island, he has unparalleled beauty as well as an ability. Created the Verters to provide peace and order within Mermaid, and many look up to him.

Second-in-command of the Verters that rule over the castle. Also the leader of the Ardelle (nobility class), a small elite group of those with powerful abilities. Deeply fixated on preserving public peace within Mermaid and Feste, she often forces her own opinion forward, and is cold-blooded enough to immediately be rid of those who have no power.

Commander of Verters, the group that rules over the castle. A girl whose body with well-balanced curves and short hair leave a lasting impression. A calm, kind personality that has the respect of Ritters (guards) and the trust of the leader Akira. Despite being a Liberator, she uses her superior martial arts skills to fight ability wielders toe-to-toe without Arms (weapons), and because of that, she is nicknamed "Zero Arms".

A girl that lives a carefree life on Mermaid without affiliation to either Feste (castle) or any village. She has a daring biker look, and possesses various passionate emotions within her cool composure. Always acts together with her partner Lady J, and those around them refer to the pair as Lady Lady.

A girl with many mysteries, who has both a well-endowed body and a bewitching appearance. Her personality is pretty collected and does not speak much, but the mental link with her partner Rain Hasumi is very strong, and their relationship is built on heavy trust. She seems to be investigating Mermaid island together with Rain, but her actions are still shrouded in mystery.

A mysterious girl transferred to Mermaid after Mirei and Marimo. Her skills as an Exter had already been present by the time she arrived on the island, and her ability is powerful. Possesses both an easygoing personality that isn't scared of anything, and a cold-heartedness characteristic of her purity. Often causes issues with others with her words and actions, and throws her surroundings into a chaotic storm.

The caretaker of the village existing in a corner of Mermaid that welcomes girls with nowhere to go. With her amazing figure and welcoming personality, the girls of the village call her by the nickname "Miss Caretaker". Very sensitive about her age, and asserts that she is 17 years old, but her actual age is unknown.