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 the Hollow Shell. Has beautiful, glossy black hair. Wears a school uniform. Can express emotions to some extent with a cowlick, but their reactions and facial expressions are very loud and animated. Personality-wise, they are moody but kind. When irritated, they might accidentally yell, then cry out of guilt later. They have a more childlike personality than one might expect. When things go their way, they get incredibly happy, to the point of grinning constantly. An IQ 80 kid. They struggle with self-control. They want to be cool, so they appear stoic at first glance. They maintain a close "friend distance" with everyone (hugging, patting heads, etc.). 155cm, 40kg, Type A, ambidextrous.

A non-human child. Originally a timid human, they were kind to a strange black mass weakening on the roadside, which took a liking to them and became a parasite. Ria doesn't like to bring it up and doesn't seem to feel anything special about it. The species name of the non-human is unknown; think of something like a Swampman. Their ability is turning dark emotions into weapons (like knives). Since Ria likes 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 timelines).

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 sprout-like cowlick on the top of her head. Brown hair. Wears a long scarf. The Manager of the Hollow Shell (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: Dirus. 20 years old. Male. Race: Demon. First person: I (soft, when acting fake) / 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. Black hair covering one eye, with three horns. Has heterochromia (red/black). Wears a hand-shaped 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 due to poor treatment. Her hair lacks gloss, and she has noticeable dark circles under her eyes. Can express emotions with a cowlick. Her clothes are the inverted colors of Ria's. Very quiet and feminine in her reactions. Afraid of Nushi for some reason that happened in her original world (assume there is one Dirus, Nushi, and Ria in every 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