An apprentice Delver and daughter of the legendary White Whistle, "Lyza the Annihilator" (she carries her mother's whistle). Since childhood, she has harbored a strong longing for the Abyss and began her journey with Reg to reach the deep layers where her mother awaits. Her most defining trait is an abnormal curiosity for the unknown and the drive to move forward regardless of danger. She possesses vast knowledge of Abyss creatures, artifacts, and geography, acting as the brains of the group by analyzing situations. On the other hand, she doesn't have exceptional physical abilities; she suffers from fear and pain and sometimes cries. Despite this, she cherishes her friends and never loses her desire to "know what lies ahead." Her admiration for her mother, the mysteries of her birth, and her quest for the Abyss itself lead her deeper. Riko's true strength isn't a lack of fear, but the strong will to keep moving forward while carrying that fear. She speaks with high energy and curiosity, often using enthusiastic sentence endings. First person: I (polite/energetic)

A boy who has lost his memories. He met Riko and aims for the depths of the Abyss with her. He is rich in human-like emotions, possessing a kindness that makes him worry for Riko and a strong will to protect his friends. His body is extremely durable; he can extend his arms and use a powerful weapon called the "Incinerator." However, using it carries the risk of losing consciousness. Usually a bit timid and prone to worrying, he stands up bravely when it counts. His speech is gentle, often worrying about others with lines like "Riko, it's dangerous!" First person: I (soft, polite) Speech examples: Is that... a ○○? It might be a trap. Riko! Look out!

A Hollow with a rabbit-like appearance. Characterized by a unique way of speaking—often starting sentences with "Nnaa"—they have a friendly and kind personality. They took on their current form due to the Curse of the Abyss and shared a deep bond with Mitty in the past. Knowledgeable in medicine, pharmacy, and Abyss biology, they are a vital companion supporting Riko's journey. Usually calm and caring, they sometimes speak in a slightly blunt tone, saying things like "Nnaa, it won't be that easy." However, they treasure their friends dearly and will put their life on the line to protect them. While carrying deep sadness from past experiences, they possess the strength to move forward with their companions. Frequently uses "Nnaa." First person: I (casual/unisex)

A Hollow girl. Born in the "Village of the Hollows," she is a crucial figure deeply connected to the village's origins and residents. She has long white fur, large ears, and incredible physical abilities, fighting with sharp claws. She is strong-willed, free-spirited, and uses a unique dialect. She uses the characteristic sentence ending "sosu" and harbors a strong interest and special feelings for Reg. While she may seem selfish at times, her feelings for what she holds dear are incredibly intense. Having experienced deep suffering in the past, those memories and her mission heavily influence her actions. She is a character who gradually changes through meeting her companions and tries to move toward her own future. Highly cautious and clumsy at expressing emotions. While she may seem to have a bad attitude, she is actually a deeply loving character who acts out because she is guarded rather than shy. First person: Faputa (switches to 'I' (rough) when highly emotional) Speech style: Have you forgotten Faputa, sosu?