Haruue Erii

Haruue Erii (春上 衿衣) is a character introduced in the Toaru Kagaku no Railgun anime. She is a level 2 Academy City student and a Child Error.

Appearance
She is a young girl around the same age and build as Uiharu Kazari. She has a short, dark hair, where she has tied a few strands of them together in the left side of her head.

Personality
She is shown as shy and soft-spoken but kind girl, however, she is often times shows a little eccentricity, like suddenly staring into space or walking into a glass window. She is also fond of eating, and has shown to try eating something that seemed edible to her; her fondness for eating often causes her to get food she is eating on her mouth.

She has a tendency of ending most of her sentences with "nano," which is a feminine copula.

Background
She and Edasaki Banri were close friends in a Child Error orphanage they were in; they were both telepathic and would often communicate to each other with telepathy. Eventually Banri was transferred to another Child Error facility (presumably to the Advanced Education Department, where she would meet Kiyama Harumi) and promised each other they would meet again. Erii has a picture of Banri inside a locket as a reminder of her friendship with her.

She eventually enrolled to a school in the 19th school district, however, she began to hear the telepathic beckonings of Banri (as she was trying to wake up from her comatose state). Because of this communication with her, it caused an RSPK Syndrome occurence whenever she would use her telepathic powers to communicate with her, some times causing damage.

She later transferred to Sakugawa Middle School, at the height of the Poltergeist Incidents.

Poltergeist Arc

 * Main article:Poltergeist Arc

When she first appears, she is looking for the locket that she had lost. She is aided by an Anti-Skill member.

Several days later, she returns as a transferree from the 19th District of Academy City to Sakugawa Middle School and becomes classmates with Saten Ruiko and Uiharu Kazari. Their teacher decides to makes her Uiharu's roommate, which appears to please her quite a bit. Misaka Mikoto, Shirai Kuroko and Saten Ruiko help her move into Uiharu's apartment, and they become fast friends. That night they go to a Fireworks Festival, but their merriment is cut short when another Poltergeist incident occurs. This makes Kuroko suspicious of Erii.

The next day, Uiharu takes Erii to Nature Park, where Erii tells Uiharu that she is looking for a dear friend. With Misaka Mikoto's help, Kuroko discovers that Erii can sometime display powers beyond her normal level.

Erii is later taken into custody by MAR. Therestina, MAR's captain, tells everyone that Erii is incapable of causing the Poltergeist incidents, but Kuroko is still suspicious of her, and this strains her relationship with Uiharu. Erii later reveals that the person she is looking for is Edasaki Banri, a student of Kiyama Harumi who was subject to the test on the analysing the overloading of abilities by Kihara Gensei.

After Therestina recovers Banri and the other children from Harumi's care, Erii is reunited with the still-comatose Banri. She is later kidnapped by Therestina along with the rest of the comatose children. It is then discovered that Therestina is the granddaughter of Kihara Gensei and that she plans to continue his experiments with the Crystallized Esper Essence in the hope of creating a Level 6 esper.

She is awoken by Uiaru, when they catch up to her, and se witnesses the battle between Mikoto and Therestina as well as the latter's eventual defeat. After the battle, she reassures Kiyama Harumi that Banri trusts her as well as her decisions. This allows Harumi to use the crystal to finally wake her students. Banri, using telepathy, thanks Erii for listening to her words.

Erii is later seen with Banri and the other children on the rooftop of a hospital. They are waiting for the blimp to broadcast their message to Kiyama Harumi. This is a present for her birthday.

Sisters Arc

 * Main article:Sisters Arc

Erii tells Uiharu, over the phone, that she will meet up with everyone after she vists the hospital.

Erii can later be seen along with Kuroko, Mikoto, Saten, and Uiharu in a picture on the wallpaper of Mikoto's phone. This is one of the pictures that were taken on the day when Erii first met everyone.

Ability
She is a Level 2 telepath, and is shown to be able to communicate telepatheically with other people. However, her ability can show powers above that of her normal level, when exposed to certain frequencies. Because of this, she was the target of Therestina's attempt to use the exposure of the Crystallized Esper Essence on her, so Erii can become a Level 6.

Trivia

 * At first, she is thought to be a filler character unique to the anime series, making little to no impact in the story if she is taken out of the story of Toaru Kagaku no Railgun and, by extension, Toaru Majutsu no Index. However, her mention in the Toaru Kagaku no Railgun manga rules out that claim.
 * Furthermore, she (alongside Uiharu and Saten) appear in the background of one of the colored illustrations from the New Testament Light Novel Volume 1 (behind Team ITEM), solidifying her existence (as well as the Railgun Poltergeist Arc) in the Index universe.
 * Erii also appears in vol 6 of the manga, and can be seen in a picture on Misaka's phone's wallpaper. This is one of the pictures taken in episode 20.