Hiro

Hiro (ヒロ) is one of the main characters in DARLING in the FRANXX series. He was known as a prodigy Parasite with the codename "016" of Thirteenth Plantation, where he's partnered in a boy-girl pair to pilot a FRANXX.

Appearance
Hiro has a standard "slim" male physique with black, shaggy hair and rich blue eyes. His checkered past has left him with an emphatic expression on his face, despite his personality. He develops a blue growth of some kind on his chest after piloting with Zero Two a second time.

In Episode 5 he had something in his chest, which is mostly because he has piloted with Zero Two for 2 times, which increased his yellow blood cell counts, the polar opposite of what happens when Zero Two rode with other parasites.

Personality
A former star student of the academy, Hiro's inability to pilot FRANXX has left his hopes low, even to the point of choosing to leave Cerasus until his former partner Naomi encourages him to stay. His emotions are strong, but his heart keeps him from giving up.

Losing the ability to pilot left him feeling that his life had little worth, to the extent that he is more than willing to ride with Zero Two even if it means his death.

History
He came from the same orphanage as Naomi, Ichigo and Goro and later become Naomi's partner. They failed the exam and Naomi was forced to leave Plantation 13. Hiro, however, was given a special permission to stay, which he declined. Naomi's plane was attacked by a klaxosaur, but she survived.

Zero Two
Hiro first met Zero Two when she was skinny dipping. Despite that others may discriminate her for her horns, he found that they are alluring. When they met, both of them were lonely and shared the struggle of not being able to pilot. After kissing Zero Two and piloting Strelizia, he was keen to do it again and prove his ability. Hiro blushes when Zero Two is around him, but does not seem to be uncomfortable with her presence.

Ichigo
Ichigo is Hiro's childhood friend. He cares a lot about her, but seems to be oblivious to her feelings for him. When Hiro piloted Delphinium with her, their compatibility was 100%, higher than any other pair. However, their FRANXX deactivated shortly after. When Ichigo kissed him at the end of episode 2, he felt nothing but guilt.

Goro
Goro and Hiro have a good relationship and grew-up together. He's often supportive of Hiro and cheers him on in his endeavors, hoping that he finds success and happiness. Likewise, he hates seeing him hurt and so learning that Hiro is dying from piloting with Zero Two leaves the latter feeling frustrated. They share a room.

Zorome
Zorome and Hiro have clashing personalities. Zorome often mocks Hiro and his inability to pilot.

Mitsuru
Mitsuru and Hiro have a negative relationship. Mitsuru seemed to have looked-up to Hiro, but finds his current inability to pilot pathetic. He mocks him and seems to have an inferiority complex against him.

Naomi
His former partner while training to become Parasites. When tested in their ability to connect to each other, it is shown that they are unable to do so resulting in failing with Naomi being expelled, and Hiro choosing to leave, despite HQ giving him the rare chance to remain in hopes of getting a partner that is compatible with him. Naomi cares for Hiro enough that she gets upset that he chose to leave Plantation 13 along with her. When they're meant to get on a transport to leave, she prevents him from getting on board by throwing her suitcase at him. The last thing she tells him is that she likes the name he gave her, and that she hopes he finds a good partner.

She supposedly survived the klaxosaur attack and is undergoing medical treatment within Plantation.

Etymology
Hiro's nickname may use some of the numeral's readings from his real name "Code:016": hi from 1 and ro from 6.

Quotes
"I feel myself going deeper inside you!" - Episode 4; he says this to Zero Two inside the Strelizia (of course, not that kind of deep, Innuendo)

Trivia

 * It is revealed in Episode 3 that Hiro has a chance of being a "special specimen", due to his inability to pilot a FRANXX except for Strelizia with Zero Two.

Hiro Хиро