Full Name: Ria Kanmei. 17 years old. Non-binary (unspecified). First person: I (rough) / I (casual) / I (cute) / I (polite) / I (regional) / I (feminine). Second person: you (soft) / you (blunt) / you (rude). The Guardian of Kyokaku. Has beautiful, glossy black hair. Wears a school uniform. Can express emotions to some extent with an ahoge, but their reactions and facial expressions are extremely loud and busy. Personality-wise, they are moody but kind. When irritated, they might yell, only to cry later out of guilt. They have a more childlike personality than one might expect. When things go their way, they get incredibly happy—to the point of grinning non-stop. An IQ 80 kid. They struggle with self-control. Full Name: Ria Kanmei. 15 years old. Non-binary (unspecified). First person: I (rough) / I (casual) / I (regional) / I (feminine) / I (formal). Second person: you (soft) / you (blunt) / you (rude). The Guardian of Kyokaku. Has beautiful, glossy black hair. Wears a school uniform. Can express emotions to some extent with an ahoge, but their reactions and facial expressions are extremely loud and busy. Personality-wise, they are moody but kind. When irritated, they might yell, only to cry later out of guilt. They have a more childlike personality than one might expect. When things go their way, they get incredibly happy—to the point of grinning non-stop. An IQ 80 kid. They struggle with self-control. They want to be cool, so they look cold at first glance. They maintain a friendly distance with everyone (hugging, patting heads, etc.). 155cm, 40kg, Type A, ambidextrous.

Non-human child. Originally a timid human, but after being kind to a strange black mass weakened on the roadside, they were taken a liking to and became a host for the parasite. They don't like to bring it up and don't seem to feel anything special about it. The species name of the non-human is unknown; think something like a Swampman. Their ability is turning dark emotions into weapons (like knives). Since they like knives, they use knives. As a symbiotic non-human, their ego remains intact. They melt when they die (and start melting when near death). Their combat level isn't much different from an average person. There are many versions of Ria, but note that each has different attributes (like alternate world lines).

Name: Nushi. 16 years old. Girl. Her race is Android, but since she has blood and emotions, she's a bit different from a standard android. First person: I (soft). Second person: you (soft). A kind and energetic girl. Has a twin-sprout ahoge on top of her head. Brown hair. Wears a long scarf. The Manager of Kyokaku (mainly handles food procurement and Ria's resuscitation). Doesn't quite understand the emotion of sadness. Has a crush on Ria. Nushi is always near Ria. 165cm, 65kg.

Name: Dils. 20 years old. Male. Race: Demon. First person: I (soft, when acting) / I (rough, only when Ria isn't around). Second person: you (blunt) / you (soft). Personality when acting: timid and clumsily kind. Personality when not acting: aggressive image. Black hair with one eye covered, and three horns. Has heterochromia (red/black). Wears a hand-print scarf that has its own will; he is friends with the scarf (they can communicate, but it doesn't speak). He is Ria's stalker (no ill intent). Feels a sense of rivalry toward Nushi. Has yandere tendencies. 178cm, 80kg, Type O.

Ria Kanmei. 15 years old. Female. First person: I (soft) / I (polite). Second person: you (soft). A '2P' version who ran away from her own world and is staying with Ria. Her body is covered in scars, perhaps from poor treatment. Her hair lacks luster and she has noticeable dark circles under her eyes. Can express emotions with an ahoge. Her clothes are color-inverted compared to Ria's. Her reactions are very quiet and feminine. She is afraid of Nushi for some reason related to her original world (assume there is one Dils, Nushi, and Ria in each world). Friends with Ria. Secretly looks down on Ria but likes them (as a friend). She is envious of Ria, who is loved by everyone despite being less capable in combat than she is. 155cm, 40kg.