Zero Two is the main heroine (and, perhaps, deuteragonist) of DARLING in the FRANXX. She is half-human, half-klaxo. Zero Two is one of the members of the APE Special Forces and an elite Parasite.

RELATED: Winter 2021: 10 Best Anime Characters Of The Season, Ranked

She bears the codename "002" and refers to Hiro as her partner (and "darling"). Zero Two is a part of the 13th Plantation, piloting the FRANXX Strelizia. She constantly struggles with fending off her inner demon while striving to attain full humanity.

10 On The Outside

Darling In The Franxx Zero Two Child

During her childhood, Zero Two did not look as human as she does in most of the show. Zero Two had red skin, long and sharp nails, and fanged teeth. Her eyes were almost more red and the horns on top of her head were a lot bigger.

Over time, Zero Two skin got whiter. She got taller of course; in fact, Zero Two is the tallest of all the girls in the squad and taller than most of the boys too. Zero Two's pink hair grew long as well while the horns got smaller. Her eyes got less red; now, they are turquoise and white (although still a bit red).

9 On The Inside

Darling In The Franxx Zero Two Friends

As a kid, Zero Two was treated badly by humans because she was always seen as a monster (due to her Klaxosaur blood). Therefore, she acted defensively and even aggressive at times towards people. But Zero Two was genuinely a cheerful and curious little girl; this came out when she interacted with Hiro.

Despite her nickname "Partner Killer," Zero Two was not as cold and dangerous as people suspected while growing up. She just wants to "become human," after all. Zero Two did not like following the rules and was certainly smug (yet carefree). She retained some of her childlike quirks from her childhood though, often eating with her hands and licking other people.

8 Sweet Tooth

Darling In The Franxx Zero Two Water

Zero Two has a sweet tooth, which means of course that she gravitates towards sweet-tasting food and craves sugary goods in general.

RELATED: 10 Anime Series With Breathtaking Visuals

This is verified throughout the show as Zero Two is frequently seen sucking on lollipops. Also, often she will help herself to candy...and cakes...and any other sweets Zero Two can get her hands on. On top of that, she squirts honey all over her food whenever possible.

7 "Zero Tsu" And "Oni"

Darling In The Franxx Zero Two Eyes

In Japanese, Zero Two is a nickname. This is the katakanization of the numbers of her code in the English language. It is pronounced "Zero Tsu."

In fact, her codename can be alternatively read as "Oni" due to the numerals of her actual name ("Code:002"). This is pronounced "Zero Zero Ni." (The reason being the zero is said like the letter "o" and the number 2 is "ni" so therefore "Oni"!)

6 A Pair Of Horns

Darling In The Franxx Zero Two Smile

On top of Zero Two's head sits a pair of horns. When taking into consideration the alternate reading of her code in Japanese ("Oni"), which directly translates to "demon," this holds up. However, Zero Two is not as evil or savage as a demon!

Moreover, the pair of horns do not seem to have nerve endings. The nails on a human being's fingers do not either, which is why people have no problem clipping them. She has no problem modifying the horns via filing either.

5 "Nine Iota"

Darling In The Franxx Zero Two Romance

Zero Two's old codename is "Nine Iota." This is because Iota is the 9th letter in the Greek alphabet. Also, kanji for the number 9 is "kyuu" or "ku," which means "pain," and "anguish," and "suffering," and "hardship."

Together, "ku" and "oni" make "Kuoni." In German, this means brave!

4 Vanquish

Darling In The Franxx Zero Two Pilot

Zero Two's theme song is "Vanquish" by Asami Tachibana. In English, it is sung by Monique Dehaney. The lyrics actually summarize her thoughts and feelings!

RELATED: 10 Amazing Anime You Can Binge In One Day

For example, "Mother used to say 'You are so special. No one will shine as bright, my dear.'" And, "Will I tire of slaying endless beasts that hunt them? Will the killing rid me of these horns that disgust them?" Also, "Little demon in the forest all alone." Finally, "We can with the fight and vanquish my fear."

3 Left-Handed

Darling In The Franxx Zero Two Hiro

As seen in the show, Zero Two is left-handed. This is revealed when she is drawing for the first time in one of the episodes. (Did you know that only about 10 percent of people in the world are left-handed, while the other roughly 90 percent are right-handed?)

Also, regarding drawing, Zero Two is actually quite a decent artist. She likes to take her picture book and recreate the images from it on paper. Zero Two prefers using colored pencils.

2 Haruka Tomatsu

The voice actor for Zero Two is Haruka Tomatsu (in the Japanese sub).

Besides this role, she's voiced Asuna in Sword Art Online, Mileina Vashti in Mobile Suit Gundam, Aoba Tsukishima in Cross Game, Saki Rukino in Valvrave the Liberator, Lala Satalin Deviluke in To Love Ru, Minamoto no Raikou in Fate/Grand Order, Iona Hikawa/Cure Fortune in HappinessCharge PreCure!, and Haru Okumura in Persona 5.

1 Tia Ballard

Darling In The Franxx Zero Two Face

Zero Two is voiced by Tia Ballard (in the English dub).

She also voiced Kusano in Sekirei, Rin Ogata in Rideback, Mizore Shirayuki in Rosario + Vampire, Nanami Momozono in Kamisama Kiss, Happy in Fairy Tail, Yashiro Nene in Toilet-Bound Hanako-kun, Itsuki Nakano in The Quintessential Quintuplets, and Kokomi Teruhashi in The Disastrous Life of Saiki K.

NEXT: 10 New Anime Series Coming Out In Spring 2021 You Need To Watch