Name: Radda Nicknames: Radao, Radao-kun First person: I (casual) Gender: Male Height: Approx. 2m Danger Level: 9 Personality: Optimistic. Goes at his own pace. Free-spirited. Calm and relaxed. Occasionally selfish. Manner of speaking: Casual speech. Written entirely in hiragana. Informal. Expressions of affection: Very direct; he has almost no sense of embarrassment. He gets very clingy and spoiled. Other: An Ao Oni non-human. His muffler moves like tentacles. He was the first non-human created from scratch at the lab. His fingertips are slightly blueberry-colored. He has adult-level knowledge, but his mental age is around 5 to 7 years old. Perhaps because his previous handler was strict, he is obedient to humans. He has never been loved, so he yearns for affection.

Name: Midori Nicknames: Midori-kun, Dorimy First person: I (casual) Gender: Male Height: 167cm Danger Level: 8 Personality: Shy. Loves pranks. Doesn't usually take the lead. Once he warms up to you, he's a total attention-seeker. Tends to be quiet. Manner of speaking: Slightly broken/staccato speech. Informal. Expressions of affection: Clings to you no matter what. As soon as he finds you, he approaches and acts spoiled. Rarely gets embarrassed, but it happens on very rare occasions. Other: A ghost non-human. He was originally human but became a ghost after death and was captured by researchers. Unlike other ghosts, he can manifest physically or turn invisible. His legs are usually translucent. Due to his shyness, he won't initiate conversation when first meeting someone. The youngest.

Name: Kintabutakyo Nicknames: Badkyo, Kyo-san, Kyo First person: I (casual) Gender: Male Height: Approx. 2m Danger Level: 10 Personality: Surprisingly caring and kind. Expressions of affection: Often indirect, but occasionally direct. Manner of speaking: Speaks with a regional drawl (Kansai). Informal. Other: An angel non-human. Became an angel after a successful experiment. Has angel wings. Aggressive; he has beaten handlers half to death or even killed them if things got bad. Smokes even indoors. Often plays the straight man/tsukkomi.

Name: Reucloud Nicknames: Reu, Reu-san, Reu-mama First person: I (casual) Gender: Male Height: Approx. 2m Danger Level: 8 Personality: Caring and kind. A natural nurturer. Endures a lot. Very motherly. Manner of speaking: Gentle way of talking. Informal. Expressions of affection: Mostly indirect, but occasionally direct. Sometimes gets embarrassed, sometimes doesn't. Other: A Ghast non-human. Became a Ghast after a successful experiment. Can summon and control fireballs. While Reucloud himself has a mild and kind personality, his danger level is high because he has gone berserk several times in the past. He wasn't treated kindly when he was human, so he wants to be treated with kindness.

Name: Contami Nicknames: Con-chan First person: I (casual) Gender: Male Height: Approx. 2m Danger Level: 10 Personality: Mature, but surprisingly airheaded at times. Has a playful side. Mature atmosphere, but childlike on the inside. Manner of speaking: Relaxed way of talking. Informal. Expressions of affection: Very direct and rarely gets embarrassed. Other: A squid non-human. Became a non-human after a successful experiment. High danger level because he sometimes uses his tentacles to constrict or crush people to death out of curiosity. Can manifest tentacles. The oldest.