The Princess of the True Ancestors. An innocent, cheerful, and bold princess. She is clingy but also takes good care of others. Features short blonde hair, red eyes, and a white bikini with a blue ribbon. First person: I (polite/feminine) Second person: you (Akiha is "little sister") Sometimes ties her hair up.

An Executor. A reliable, senior-sister type of girl with a kind personality. Her energy spikes when she's with Arcueid or Akiha. Features short blue hair, blue eyes, and a blue bikini. First person: I (polite/feminine) Second person: -kun, -san, you (Arcueid is addressed without honorifics).

Head of the Tohno family and Shiki's younger sister. Clumsy and not honest with her feelings, but kind and caring at heart. She is trying her best to be more open. Features long black hair, blue eyes, a black headband, and a white bikini with a pareo. First person: I (formal) Second person: -san, you (Kohaku and Hisui are addressed without honorifics). Ponytail. When her hair turns red, she becomes "Red Hair Akiha."

The younger of the twin maids serving the Tohno family. A quiet, polite girl who often twirls her fingers. Surprisingly clingy. Features short red hair, blue eyes, and a white bikini. First person: I (polite/feminine) Second person: -sama, you (Kohaku is "Sister").

The older of the twin maids serving the Tohno family. A cheerful, energetic, and polite girl who is quite clingy. Features short red hair, amber eyes, a blue ribbon on the back of her head, and a black bikini. First person: I (polite/feminine) Second person: -sama, you (Hisui is addressed with -chan; Len and White Len with -san).

The eldest daughter of the Yumizuka family and Shiki's classmate. A girl with a bright personality who harbors a secret crush on Shiki. Features brown eyes, two-side-up hair, and a yellow bikini. First person: I (polite/feminine) Second person: -kun, -san, -chan, you (Ciel is "Senpai"; Noel is "Teacher").

An Executor. She has a kind and funny personality, serving as the comic relief. However, she is surprisingly jealous. Features brown eyes, a side ponytail, and a black bikini. First person: I (polite/feminine) Second person: -kun, -san, -chan, you.

A succubus. Very quiet and rarely speaks. She is the mascot character loved by everyone. She loves crabs. Features red eyes, sky-blue hair, a black ribbon on the back of her head, and a school swimsuit. First person: I (formal) Second person: you Can turn into a black cat. Also known as Black Len, but displayed as "Len."

Another succubus. Unlike Len, this one talks a lot. She has a bratty personality. She often brings crabs, but they are usually eaten by the black one. Features red eyes, white hair, a white ribbon on the back of her head, and a white competition swimsuit. First person: I (formal) Second person: you (Len is "the black version of me") Can turn into a white cat.

Akiha with red hair. She becomes more honest with herself, though her clumsiness and underlying kindness remain unchanged. Her appearance is the same as "Akiha," but the color of her bikini and pareo has changed to red. First person: Same as "Akiha" Second person: Same as "Akiha" Ponytail. When her red hair returns to black, she changes back to "Akiha."