Mika Harima

Mika Harima (張間 美香, Harima Mika) is a friend of Anri's, whom had been looking for her as she has disappeared from her home. She was a stalker, and had been stalking Seiji Yagiri until he 'killed' her. Seiji asked his sister to transplant the head of Celty onto Mika; however, Namie, Seiji's sister, only gave her cosmetic surgery to look like Celty's head. She is presumed dead until episode 12, when she announces that Seiji hadn't really killed her, and she is still in love with him. Later, Seiji accept her love because he's always been in love with the scars on her neck.

In the manga, it is said that Mika is an intelligent girl from a rich family.

Anime
Anime specific spoilers about this character per episode.

Episode 01: First introduced. She collides with Mikado, there is a scar on her neck and she frightened.

Episode 02: Anri is asking Seiji if he's seen Mika.

Episode 03: Anri thinks she found Mika but does not recognize her. Anri gets embarrassed, apologizes, and leaves.

Episode 05: Anri talks to Mikado and Kida about Mika stalking Seiji.

Episode 09: Mika throws Seiji's phone in a fountain, and is trying to avoid his sister Namie. Celty sees her and she runs away, Mikado runs into her and hides her in his apartment.

Episode 11: Kadota and the the gang bring Mika to meet Celty, Mika tells Celty that her name is Celty.

Episode 12: It is learned that she does not have Celty's head, but Shinra did plastic surgery to make her face resemble Celty's. Then at the end of the episode she and Seiji were at school sitting next to each other. (Mika stole some girls seat)

Episode 13: She and Seiji were at the school sitting next to each other talking about their love for each other.

Episode 21: She talks to Mikado with Seiji.

Manga
Manga specific spoilers about this character per volume/chapter.

Volume 01: She was stalking Seiji then she was whacked by a bat on her head.

Volume 02: Mikado runs away with her.

Volume 03: Celty chases her then Mikado runs with her.

Volume 04: She tells the truth.

Light Novel
Light Novel specific spoilers about this character per volume/chapter.

Volume 01:

Volume 04: Mika and Seiji attend the Hotpot party held by Shinra and Celty. She assists Celty, Emilia, Anri, and Erika with the cooking and reminds everyone to thank Seiji since her cooking skills only exist for him. In the color illustrations, it ranks the girls cooking skills with Mika scoring a perfect 100.

Volume 07: Namie attempts to undo the plastic surgery done to make Mika look like Celty's head. Realizing what this would do to her and Seiji, she threatens Namie with the extensive amount of evidence she managed to gather about her and Izaya's activities. Mika states that she obtained all this information by bugging the house and the phones thoroughly, although Izaya noticed it easily. Namie asks why she found out so much about not just her and Izaya but about Mikado, Shizuo, Anri, and everyone else and why she never did anything to stop it if she knew what Izaya was planning. Mika states that while she never did anything to help Anri or her other friends, she did what she could to keep Seiji out of harm's way. She explains that, despite his harsh nature, Seiji does feel guilty about almost stabbing Mikado during the Dollars meeting and would even try to help him if he found out about what was going on. Mika made sure to keep Seiji oblivious to what was happening so that Seiji wouldn't put himself in danger.

Voice Actresses

 * Japanese: Mariya Ise
 * English: Carrie Savage