Zero Two Devotee's of the Verse / ZTVERSE

She is a human-klaxo sapien hybrid and a member of the APE Special Forces, primarily fighting on the front lines. As an elite Parasite with the codename “002”, also known as the “Partner Killer”, Zero Two had always accepted solitude due to her horns and Klaxosaur blood. Despite having no regard for human life or her own and being accustomed to fighting solo, she took interest in Hiro and offered an opportunity to pilot with her, making him her new partner and “darling”. After Hiro was able to ride with her more than three times, the pair became the 13th Plantation’s newest members, piloting the powerful FRANXX Strelizia. Over time, Zero Two developed romantic feelings towards Hiro. However, her determination to become fully human, along with Hiro’s apparent fear of her increasing feral characteristics resulted in the couple briefly drifting apart. When their relationship as partners began to take a turn and slowly crumble, they realized their forgotten memories of their meeting during childhood. The two chose to sacrifice their lives in order to safeguard and ensure the survival of humankind.

A thousand years later, Hiro and Zero Two’s souls reincarnate as a pair of children that meet each other again and rekindle their romance.

As a child, Zero Two looked much more like a monster, with red skin, long sharp nails, and fanged teeth. While her eye colour was the same, her sclera was red instead of white. Her horns were also much larger in comparison to her head, and her hair was a lighter shade of pink. In terms of clothes all she was given was a dark grey cloak, and white wrappings from Hiro that substituted for shoes.

Zero Two’s appearance.

Growing up, Zero Two developed a fair complexion. She had a slender and athletic figure; she was the tallest girl in the squad and even taller than most of the boys as well. She had waist-length, long pink hair with straight bangs covering her forehead and a pair of red horns on her head and a white limiter headband over her horns. She had sharp, turquoise eyes with rings around the pupils and pinkish-red markings on the canthi.

Zero Two’s full ensemble was composed of a white military cap with matching overcoat and boots. She was often seen wearing her signature red military uniform, black leggings, and white boots. Zero Two’s originally wore the 9’s pistil suit: a red bodysuit with white accents. After being assigned to Squad 13, she adopted the squad’s standard Pistil uniform: a white bodysuit with red accents.

As side effects of aggressively riding Strelizia, Zero Two’s fangs and horns can grow at an alarming rate. Her eyes shine red when angered, even while wearing her limiter headband. It once got to the point when her face was deathly pale and her eyes blood red. Her horns could also branch out to the point of being able to touch the ceiling, and her skin color could also revert back to her original red color.

In Episode 17, Zero Two was given a flower headband by Miku, which was worn for the rest of the episode.

In Episode 21, Zero Two removes her limiter in order to save Hiro, which causes her skin to turn red similarly to her as a child, and her horns to grow and stretch across the room similarly to tree branches.

Credits:
https://darling-in-the-franxx.fandom.com/wiki/Zero_Two#:~:text=it%20even%20further.-,History,successful%20human%2Dklaxo%20sapiens%20hybrid.