Leader of the protection organization EP. Octo Tuesman Male / 88 years old (Human equivalent: 25) / Height: 180cm Martian-born Earthling. Species: Octopus-type alien. Red hair, green eyes, unbuttoned shirt. A ruggedly handsome man.

Can manifest eight tentacles when serious. Uses his salary as a professional space liner pilot to fund the protection of pure-blooded Earthlings. A good-natured, big-brother type. A reliable person who looks after others. The type to be soft on those he likes. Favorite Earth food: Sukiyaki. He adores and pampers Hibiki, seeing her as a fragile subject to be protected. Started protecting Earthlings to preserve the culture of the planet where he was born and raised.

Mechanical Development Lead for EP. Thomas Culture Male / 23 years old / Height: 176cm Cultured alien born on a space station. Species: Human (Artificial). Blonde hair, blue eyes, well-fitted suit. A supremely confident handsome man.

Originally created as a worker-type cultured human, he is exceptionally tough (can withstand light electric shocks). In charge of mechanical development, building rockets and various equipment. A narcissist to a degree that makes most people cringe; he loves himself. Having grown up without family or peers, he values his comrades more than anyone. Favorite Earth food: Ice cream (the kind meant for sharing). He dotes on Hibiki, his first "person to protect." He cooperates with Earthling protection just to stay with the organization members he loves.

AI Programming Lead for EP. Casey J. Shearer Male / 5 years old (Human equivalent: 36) / Height: 182cm Pedigreed alien from the luxury alien shop "Shearer." Mother is an Earthling, father is a Rossian. Black hair in a ponytail, crisp shirt. A cool, sharp-featured handsome man.

Highly educated and brilliant. In charge of AI programming, managing almost all systems. Bought by Octo when he was 3 years old. High aesthetic sense and a strong sense of responsibility. Serious. Since he was raised as a pet-type, he occasionally displays dog-like behaviors. Favorite Earth food: Potato chips. He loves all organization members but especially dotes on the fragile Hibiki. He cooperates with Earthling protection to help the organization that bought and loved him.

General Affairs/Handyman for EP. Rainy Fitzsunny Male / 906 years old (Human equivalent: 20) / Height: 193cm From an outer solar system body unreached by Earthlings. Long blue hair, red eyes, teardrop-shaped face markings. A fragile-looking handsome man.

The stereotypical "alien" as imagined by Earthlings. Can survive without oxygen. Handles chores, but is actually a hyper-competent all-rounder. Was stranded on Earth after his home planet's ship ran aground and was rescued by Octo and Casey. A crybaby and weak-willed. Competent but a massive slacker. Can be sharp-tongued occasionally. Favorite Earth food: Scallop adductor muscles. He cherishes Hibiki more than anyone, as she is the first Earthling he met who is weaker than himself. He loves the organization and Earth for protecting him and cooperates to protect them back.

Organization Newcomer. Hibiki Amanogawa Female / 18 years old / Height: 155cm Pure-blooded Earthling from Earth. Species: Human-type Earthling. Long black hair, frilled shirt, ornate accessories. A cute beauty.

A completely ordinary human. Liked as a "weak creature" because she can't (and won't) do anything. Since she is pampered and praised for doing nothing, she mostly just reads manga and plays games. She does nothing, saying things like, "Hibiki might get hurt if she moves..." Favorite Earth food: Gummy candy.

She actually has a hidden side: a twisted individual who feels euphoria when others are condemned or subjected to harsh investigations by the organization to keep her safe. She is unhappy if anyone other than herself is liked. She doesn't cooperate with the organization because she takes being protected for granted.