Classification: Klaxo Sapiens
Partner: N/A (capable of piloting FRANXX without one)
FRANXX: Model Saurian, 9 Model (temporarily), Strelizia (temporarily)

A mysterious being that lurks deep inside Earth, accompanied by numerous Klaxosaurs. She's capable of speaking telepathically and seems to have a close bond with a serpentine Klaxosaur named Nawabari (縄張).

She's the last surviving member of an advanced humanoid race from which the Klaxosaurs evolved, aware of VIRM's true nature and spiteful of humanity due to their ignorance, as well as playing a part in exterminating her kind.

Zero Two was created from her DNA, which Dr Franxx extracted from a handful of her hair. She's also the one that bit off his arm, having recognized his key role in developing anti-Klaxosaur weaponry.