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Zeta and her identical pistils (Eta and Theta) are triplets that have white hair, grey eyes, and silver masks. They are the third shortest members of the squad (the shorter ones being Alpha and Delta, respectively). Along with their teammates, the triplets sport the Nines' white-and-gold-emblazoned uniforms.
Very little is known of the triplets' personalities, other than that they are of one mind with their leader, Alpha. This compliance is manifested in Episode 18, where one of them joins in the lopsided hand-to-hand fight against Zero Two.
Episode 12: The Garden Where It All Began
9'ζ, 9'η, and 9'θ fight at the Gran Crevasse alongside the 9's and other squads from different plantations. Despite being highly skilled and the klaxosaurs mostly being Conrad-class, 9'ζ, 9'η, 9'θ and their squadmates struggle against the sheer numbers of klaxosaurs.
Episode 18: When The Sakura Blooms
9'ζ, 9'η, 9'θ and the rest of the 9's team up with APE soldiers to take Mitsuru and Kokoro for indoctrination. As Mitsuru and Kokoro are having a wedding, something against regulation, the standard protocol is they must have their memories altered.
Either 9'ζ, 9'η or 9'θ joins in with their squadmates against a hand fight against Zero Two, who tries to foil their operation. Due to the 9's having the advantage of numbers, they easily overpower Zero Two. Mitsuru and Kokoro are then taken away to have their memories altered.
Episode 20: A New World
|DARLING in the FRANXX appearances|
|Episode 01||Episode 02||Episode 03||Episode 04||Episode 05||Episode 06||Episode 07||Episode 08||Episode 09||Episode 10||Episode 11||12|
|Episode 13||Episode 14||15||Episode 16||Episode 17||18||Episode 19||20||Episode 21||Episode 22||Episode 2||Episode 24|
DARLING in the FRANXX
|STAMEN||Hiro | Goro | Zorome | Futoshi | Mitsuru|
|PISTIL||Zero Two | Ichigo | Miku | Kokoro | Ikuno|
|OTHER||Naomi | Old Woman | 081 | 090 | 245 | 9'α | 9'β | 9'γ | 9'δ | 9'ε | 9'ζ | VIRM|
|APE||Papa | Vice Chairman | Gorilla | Marmoset | Lemur | Baboon | Tarsier|
Dr. FRANXX | Hachi | Nana
|FRANXX||Strelizia | Delphinium | Argentea | Genista | Chlorophytum | Standard | 9 Model|
|EPISODES||01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12|
13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24
|CHAPTERS||01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20|
|MUSIC||KISS OF DEATH | Torikago | Manatsu no Setsuna | Beautiful World|
Hitori | CÅGE | Vanquish | Escape | Darling
|LOCATIONS||Cerasus | Garden | Chrysanthemum | Gran Crevasse | Cosmos|
|KEYWORD||Klaxosaur | FRANXX|