Naomi

Naomi (ナオミ) is a Parasite from the Thirteenth Plantation with the codename "703". She is the former partner of Hiro, who held her back from becoming a pilot due to his inability to pilot FRANXX.

Appearances
Naomi is a girl of average height. She has short, wavy dark brown hair with dark brown eyes. She wears the standard Pistil uniform.

Episode 1: Alone and Lonesome
Naomi is first seen crying as Hiro plans to leave Mistilteinn and Squad 13. A flashback reveals that the two could not establish a stable connection, preventing them from piloting a FRANXX and becoming official Parasites.

The two former partners then stand on a platform as she is about to board a transport. She then tosses her things at him, claiming she won't need them anymore and encourages him to share it with everybody. Naomi tells him that she really likes the name he gave her and hopes he will find a good partner before the doors close.

As Hiro struggles to step on the next plant, a Klaxosaur suddenly emerges from the ground, crushing Naomi's plant.

Episode 2: What It Means to Connect
Ichigo proceeds to inform Hiro that Naomi survived the attack from the Klaxosaur, and is currently recovering in a hospital.

Episode 6: DARLING in the FRANXX
During the battle between Squad 26 and Squad 13 against a horde of Klaxosaurs, the mysterious, massive structure that followed the latter eventually turns out to be a giant Klaxosaur itself. After a failed attempt to finish it from the Strelizia, the enemy proceeds to launch a brutal offensive on Hiro and Zero Two.

Hiro soon succumbs to the mysterious tumor-like growth that had been noticed earlier by Goro. However, he finds himself in a dreamlike vision at the platform where they went their separate ways. And, in turn, the moment when he and Zero Two piloted the Strelizia for the first time. Feeling he did everything he could to the bitter end, Naomi suddenly appears beside him, stating that he always feels satisfied and gives up by himself, not even listening to his partner.

He responds to his former partner he didn't give up, and that is isn't like when they split up as she appears to board the same plane as before. Simply stating this was as far as he could go, he also believes that Zero Two could still fight without him like she always did. Naomi then wonders if he is fine with that, to which he agrees. Having finally gotten to pilot a FRANXX and be of use to everyone, he claims to have no regrets. She calls him a liar before the doors close, and he is sent to another part of the vision, seeing Zero Two standing in front of a tree.

Episode 9: Triangle Bomb
As Squad 13 (sans Zero Two) received their presents from Papa, Hiro decides to gives Zero Two a mirror, feelings that it wasn't right how they would be the only ones to get a present. He then mentions it was something Naomi left behind.

Episode 12: The Garden Where It All Began
As Squad 13 disobeys orders, they proceed to visit the old facilities where they used to live in hopes that they would find Naomi again, but she is nowhere to be seen and the adults refuse to tell them where she is. This ultimately leaves her current fate unknown.

Episode 22: Stargazers
Naomi was finally seen in the room with many of the other Parasites who were deemed defective to be put in cryogenic sleep, Nana and Hachi discovered the place as the final orders of Dr Werner Franxx were given after his death.

Hiro
Their relationship is still unknown but it is stated that she somewhat regrets having a partner like Hiro because of his inability of riding a FRANXX, as well as how easy he gives up due to his self-satisfaction. However, she still admires and looks up to Hiro because he gave her a name, and she is grateful for that.

Etymology

 * Naomi's nickname may use some of the numeral's readings from her real name "Code:703": na from 7, o when written 0 in kanji "○" and mi from 3.