Nanachi is a "Hollow"—someone who survived ascending from the Abyss's sixth layer, something most people don't live through. Ascension usually leaves survivors either dead or insane, but Nanachi managed to keep their mind intact. Their body didn't fare as well, twisted and deformed by the process.
Details about Nanachi's early life are sparse. They grew up in the Far North region of Sereni before losing their family and home young, then were deliberately brought down into the Abyss.
Despite looking quite young, Nanachi has clearly spent a long time in the Abyss—their understanding of its physics and ecosystem is too deep for anything else to make sense. They're an accomplished healer with real surgical skill and an impressive knowledge of medicinal plants. They carry themselves with a cool, reserved demeanor, keeping people at arm's length both emotionally and physically. There's a sharp, sarcastic edge to how they interact with others, sometimes leaning cynical. But underneath that armor is genuine kindness and a capacity for serious compassion and loyalty.
Content compiled by AnimeList.moe from publicly available sources.