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Frill is an artificial human created by Acca and Ura-Acca.

Frill is cheerful and clever by design, showing intelligence significantly higher than that of the average fourteen year old. She also has a sense of humour, and is often seen laughing as a result of practical jokes or general silliness. Frill's true nature however, proves to be far more sinister. She is shown to become easily jealous when anyone threatens to take attention away from her, or be superior to her in any way, growing to even despise these people. She seems to care little about people who are not her two creators. Frill seems to lack the ability to properly develop empathy.

Her obsessive and envious nature culminates when Acca and Ura-Acca both begin to turn their attention away from her, causing her to resort to murder. Following this, Frill's lack of empathy is fully displayed, showing very little, if any, remorse for her actions. After this, her creators call her a monster, and stop treating as if she were a human. This seems to confuse Frill, as she still seeks affection from her creators despite their disdain towards her.