Rei Ayanami Expy

Clockwise, from the top left corner: Yin, Hecate, Noël, Kanade, Ayase, Tabitha, Yuki, Hazuki. Center: Rei.

The Rei Ayanami Expy is a character archetype most common in Anime and Light Novels, which was clearly started, or at least very, very heavily influenced by the character of Rei Ayanami, from the Neon Genesis Evangelion series.

The Rei Ayanami Character Archetype includes the following:

The character is a teenage girl, usually with a slender, petite body and pale skin.
The character has short, pale blue hair. (Variations include characters having white or cold pastel colors such as teal, green, grey or purple). May also have red or otherwise unusual eyes.
The character has an unnaturally stoic demeanor, acting in an alien or robotic manner. This is often demonstrated by the character displaying an unflinching stare, and a quiet, soft voice that is used very rarely, and mostly for answers not much longer than "yes" or "no". She may be emotionally repressed or truly emotionless in personality.
The character is, in explanation of her odd behavior, either:
- Not Quite Human, such as a clone, an alien or a robot, and her odd behavior is attributed to the fact that she is only imitating natural human behavior (and failing at it).
- Or she is human but her past is one of extreme emotional or physical trauma and loss which scarred her emotionally and mentally, resulting in her stilted, enigmatic behavior and lack of social skills.
The character's objective is to Become A Real Girl, at least in terms of normal human emotion and expression. In most cases it is revealed that she has does have a side to her which is capable of warmth and expressiveness. By the end of her story, some versions may not even fit the Sugar and Ice Personality mold anymore. Her journey of transformation is often a main source of drama in the work.

Rei Ayanami herself fit every single element of the above description. Later, many, many other characters were created basically with the premise "What if Ayanami Rei would have been a robot/ a high school student/ a bit more human/ a bit more alien/ etc.", and the continued popularity of these characters also inspired others to follow the basic archetype in ways that couldn't be called direct Expy followers of Rei herself.

Common but optional characteristics include the following:

The character is a Love Interest of the main male lead, as a part of a Love Triangle or Love Dodecahedron.
The character wears glasses.
The character is an Ill Girl. Double points if she wears a bandage over one eye.
The character is a Phlebotinum Girl and pilots a Humongous Mecha, or anything else that's important to the plot.

Compare Phlebotinum Girl, Char Clone and Shana Clone for a similar phenomenon. See also Kuudere, Emotionless Girl, and Stoic Woobie

Subtrope of Fountain of Expies.

Examples of Rei Ayanami Expy include:

Trope Namer

Rei Ayanami from Neon Genesis Evangelion, being the Trope Namer, likely deserves a bit of elaboration: Beginning the series, she is NERV's only active Evangelion pilot before Shinji, who was only recruited because Rei had been heavily injured during a test run of her assigned Evangelion, Unit 00. Throughout the series it is implied that Rei is something of a surrogate daughter of Shinji's father, Gendo, but the truth is somewhat stranger: Rei is actually a partial clone of Gendo's dead wife and Shinji's mother, Yui, with the addition of DNA from Lilith, one of the gigantic "angels" who NERV is supposed to fight against. Gendo planned to use Rei as a key part of Instrumentality, in hopes of reuniting with his wife. Also, there are several dozen Reis, and Gendo is entirely willing to sacrifice the current one and decant the next if he feels its necessary. It's implied that her emotional distance comes not from being unable to feel emotions, but rather that even though she feels emotions just as strongly as other humans, her isolated upbringing means she does not know how to express them.
- In what is undoubtedly a twist of Irony, a great part of Rei's character development deals with her having no control over her clones and not being able to rebel against Gendo because she knows she can be replaced, and none of her clones have souls aside from the one currently "active"; both of these things make it difficult for her to establish an identity and are part of what gives her Hidden Depths. Then you take a look at this page, and realize that most of these clones similarly lack such depths.

Anime and Manga

Yin from Darker than Black.
Lain from Serial Experiments Lain fits everything here, except she has brown hair.
Another borderline example, Subaru from .hack//Sign. She has short, bright blue hair, brown eyes (close enough to red), is quiet and very soft spoken as well as showing signs of being shy in RL. Also In real life, she is in a wheel chair from a terrible accident she keeps secret, and is a Meganekko. The series shared a character designer with Evangelion, so it's plausible it was a deliberate reference between the two characters.
Eureka from Eureka Seven. Very light turquoise hair, a Human Alien and is an Ill Girl and Emotionless Girl prior to Character Development, as well as slipping back into it on occasion afterwords.
Hazuki from Nogizaka Haruka no Himitsu, though she doesn't have any dramatic plotline related to it, she is just weird.
Parallel Trouble Adventure Dual has the character D, who pretty much is a straight up Expy of Rei (this show has been described as Evangelion meets Tenchi Muyo), being a bio andriod who acts like a robotic Emotionless Girl. She does however lack Rei's appearance, (which is probably because of legal issues). However she does have lime green hair. Green is close to blue, right? Right?
- Actually, they were sneaky about that. They attached Rei's background (pilot before the protagonist who was badly injured) and silver hair to Yayoi, a different female character.
Mytho from Princess Tutu is a male example. Duck spends much of the first season working to restore his emotions.
Quon from RahXephon is visually quite distinct, but she has the "speaks softly in riddles," "mysterious origins," and "possibly more than human" aspects going for her. In a series that's known for having tons of expies of Neon Genesis Evangelion characters, she's the Rei analogue.
- One of them. The other analogue is Mishima Reika: speaks constantly in riddles, always appears in places she's not supposed to be present at and generally provides lots of the show's Mind Screw. Eventually revealed to be Ixtli, the RahXephon's inner personality that physically manifests as the teenage version of Mishima Haruka, Ayato's Patient Childhood Love Interest and Love Interest he doesn't remember. Her purpose is to guide Ayato into Yolteotl in order to tune the world.
Hecate from Shakugan no Shana
Ren from Elemental Gelade (her name is even one letter apart from Rei) has waist length blue hair, green eyes and speaks in a monotone voice. Not only is she an Edel Raid (girls who can bind their soul with their Pledger and turn into a weapon) but is a Shichiko-hoji, one of the most powerful Edel Raids. Of course this means that everyone wants their hands on her. In the beginning of the show she hated Coud because he’s a human, but later starts developing feelings for him and became a couple at the end.
Noël from So Ra No Wo To. White-haired, pale skinned pilot and mechanic of the crew's Spider Tank that hardly speaks, when she does she uses a monotone and has a Dark and Troubled Past coming back from when she was a Child Prodigy. More lively when drunk.
Nozomi from Mayoi Neko Overrun
Kisaragi from Happy Lesson
Crona from Soul Eater, complete with Ambiguous Gender.
Yuki Nagato from Suzumiya Haruhi, to the point where her name is a pun on Rei's--Rei can be read as "ice", Yuki as "snow", and both Nagato and Ayanami were Imperial Japanese naval warships. Curiously, Yuki is described in the novels as having black hair (since in the Haruhi universe people have normal hair colors) but in the anime and even in the novels art, it appears of a purplish blue similar to Rei's
Tabitha from The Familiar of Zero.
Cheza from Wolf's Rain has been mentioned in a similar context. Being half-plant qualifies her as not fully human, and she always refers to herself as "this one" rather than "I". (Third person self-reference is also a characteristic of extremely polite or courtly Japanese speech, so not all usage of that qualifies under this trope.) She's also quite emotionless, although she does perk up quite a bit in the presence of wolves.
Shimei Ryomou of Ikki Tousen (Battle Vixens). Complete with bandage over one eye.
Minami Iwasaki from Lucky Star.^{[please verify]}
Primula of SHUFFLE! in the anime emotions cause her magical powers to go haywire. In the visual novel they're hoping she can gain emotions to show the program she's part of is a success, putting her into a human environment is part of the program, her magic has little to do with it. In both she is an artificial lifeform.
Eucliwood Hellscythe from Kore wa Zombie Desu ka?.
A rare male expy in the anime adaptation of the yaoi manga Sensitive Pornograph as the Extreme Doormat character Aki. He has her hair, dark reddish brown eyes and even has his arm and right eye bandaged similarly by the end of it.
Mai from Nichijou has demeanor but she's The Gadfly personified.
Echo from Pandora Hearts has the appearance and demeanor, but her Split Personality Noise is most definitely not this.
Nemu and Ururu from Bleach.
- Ulquiorra could be considered a male example.
Mizore Shirayuki from Rosario + Vampire, somewhat. Ironically less frosty than the typical example.
Miyu (or, more correctly, M.I.Y.U.), from both My-HiME and Mai-Otome.
Sen Yarizui, "the Ice Witch", from Ben-To.
Victorique from Gosick is both a Rei Ayanami Expy and Shana Clone
Mamiko Kuri from Narutaru.
Sextum in Mahou Sensei Negima fits most of the attributes, although she doesn't show any interest on becoming more human in her few appearances. Her twin 'brother' Fate might fit in as a male example of the trope. Ako looks the part, but doesn't really act like one.
Kei Ayamine from Muv-Luv "would" have been one going by her name, but is more of a The Gadfly and Kuudere mix.
Vanilla from Galaxy Angel.
Ayuki from Kashimashi: Girl Meets Girl matches to a degree. She's a slender Meganekko with a Bob Haircut. While not exactly stoic, she's quiet Deadpan Snarker who prefers science and learning over romance.
Mei Misaki, from the Another horror/mystery light-novel series most certainly qualifies. An Eerie Pale-Skinned Brunette with emphasis on eerie, dark short hair, skin so pale it is in a shade of grey, red eyes, an eye-patch resembling Rei's usual bandages, a deeply stoic demeanor and the overall feeling of creepy cuteness/cute creepyness exhaled. Visually, she is basically Rei with a pitch black hair.
Kirika Yuumura, from Noir is another brunette with similarities - Initially emotionless, although she does cry in episode one (although she's crying because she can't feel regret, not because of the dozen men she just killed), soft-spoken and created as a weapon. Her eyes are at the red end of brown, getting redder whenever there's an open fire around - used to great effect when her 'true self' comes out towards the end of the series. The series ends with her choosing between being human, or being a weapon.
Ririchiyo from Inu x Boku SS is another Shana Clone and Rei Ayanami Expy hybrid.
Inori Yuzuriha from Guilty Crown shares many traits with Rei, in both personality and situation. Stoic, seemingly emotionless? Check. Red eyes? Check. Deeply devoted to her boss, and, later, the main character? Check. Action Girl? Check. Artificial Human based on one of the protagonist's family members who nevertheless has boatloads of UST with him? Um...check. The only way for Inori to be a more thorough example would be if she had blue hair instead of pink and piloted one of the show's mecha.
Jo of Burst Angel. Dead ringer, aside from a rougher appearance. She's even referred to as an angel of death.
Yusaku Fujiki the main hero of Yu-Gi-Oh! VRAINS is a male example. He fills some qualities of a Rei Ayanami expy quite well: like Rei he has a Mysterious Past and is very emotionless, aloof and stoic with No Social Skills.
Ange le Carré from Princess Principal: a teenaged girl with cold-pastel hair and an unnaturally stoic demeanor, who has an extreme loss in her backstory, who acts like an alien sometimes with her references to the "Black Lizard Planet", and is the only one who has ready access to the setting's Phlebotinum. Oh, and sometimes she wears Purely Aesthetic Glasses.

Video Games

Gender flipped with Serph from Digital Devil Saga: an initially completely emotionless pale-skinned gray-haired almost totally silent male lead who's a digital clone of a sociopath who nearly destroyed the entire world, and is completely devoted to female love-interest Sera.
- Also from the Megami Tensei series is Devil Survivor's Amane Kuzuryu. Fits the physical and emotional description, though she is human. Her body is host to both a powerful angel and a powerful demon, though, so she's not exactly "natural", either. In her route, she reveals the reason for her behavior and wishes that she had been able to lead a more normal life.
Mari Ming Onette from Grand Chase can be called one.
Vanilla H from Galaxy Angel controls nanomachines by suppressing her emotions.
Lydia from Chronicles of Inotia: Children of Carnia.
Sybill from Alundra.
The Character Kos Mos in the Xenosaga Series is a female blue haired, red eyed Emotionless Robot which becomes more humane/defrosting. Like Rei, she and her successor Model "T-Elos" have got something to do with the plan of the antagonist/government organisation.
Tate from Fire Emblem 6 seems to fit.

Web Original

Iriana Estchell from Ilivais X, offering nearly every aspect. The one place she differs is that she's trying to avoid becoming more humanly expressive.