Originally from Tokyo, 14-year old Kouichi is forced to transfer to his mother's hometown of Yomiyama, at least for the duration of his father's trip to India. While confined because of a collapsed lung in the local hospital, he experiences a chance encounter with a strange girl, an event that foreshadows that things aren't quite right in the town, specifically in the school he eventually enrolls in.
Break the Cutie: Whenever he watches someone die, which is often since most of the deaths happen in front of him. Episode 3 was the worst so far.
Brutal Honesty: Even though Izumi is dying in front of him and asks if he remembers their first meeting, instead of lying and letting her die happy, Kouichi just says 'no'. Izumi even lampshades this trope before she dies.
Ill Boy: Damn collapsed lung, keeping him in the hospital! And making him miss his first day at his new school, which means missing the tips about the "other student"! The first episode suggests that it's hereditary and he got it from his father.
Missing Mom: His mother died after she gave birth to him.
Quiet and more than a little mysterious, Mei is the strange girl that Kouichi meets one late night at the hospital. This encounter, as well as the strange circumstances surrounding her while at school, prompts Kouichi to try to get to know her. In the process, this gets him involved in uncovering the truth behind class 3-3's dark secret.
Freakiness Shame: The second time she shows Kouichi what is under her eyepatch he remarks that her Doll's eye is oddly beautiful, and that she should go without the eyepatch more often.
The Gadfly: Mei's a Nice Girl, but she has her moments. During Kouichi's first meeting with her, she inadvertently makes him think she was a talking doll. When Teshigawara accuses her of being the extra student, she decides to mess with him and say that he could be the extra. When they look for the tape and talk about The Seven Mysteries, she jokingly confirms one.
Nice Girl: She may be creepy at times, but she's actually really nice. Just ask Kouichi.
Oracular Urchin: She knows about pretty much everything that is going on since she's the current "sacrifice" in class 3-3 and her sister died because of the calamity in April. Yet she only gives very vague hints that don't really help to understand what is going on.
Rei Ayanami Expy: She is basically Rei with a pitch black hair. 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 creepiness exhaled.
Un-Person: Her classmates pretend that she doesn't exist in hopes that it will prevent the calamity from happening. It fails not only because Kouichi acknowledges her, but because the calamity had already started with the death of her sister.
Voiced by: Takurou Kitagawa (Japanese), Chris Ayres (English)
Kouichi's father, a professor currently abroad in India due to research-related work. Kouichi's transfer to Yomiyama was prompted partly because this fact. He periodically keeps in touch with his son via calls to Kouichi's cellphone.
Catch Phrase: "Hey son! You'll never believe how hot India is right now!"
Disappeared Dad: Not really, but as mentioned he was overseas when the events of the story occur.
Foreshadowing: His talks with Kouichi over the course of the series indirectly provides hints related to the events surrounding class 3-3's situation, particularly concerning the supposed irregularities related to the "Phenomenon".
Kouichi's aunt, Reiko is an alumnus of the school that Kouchi transfers into, and was even part of class 3-3 at one point. As such she has first-hand experience about what exactly is going on, but is hesitant to reveal any details about it.
Dead All Along: She is the dead person in Class 3, rather than any of the students.
Mama Bear: She was willing to protect Mei from an angry mob, when they thought she was the extra. It comes back to bite her when Mei finds out that Reiko is the real extra and planned on killing her so Kouichi wouldn't have to. Though Kouichi ended up doing the deed anyway.
Berserk Button: While never shown onscreen, she does not like Mei spending time with Fujioka or her biological mother in fear of Mei one day running away to her.
Chekhov's Gun: Her doll making abilities allowed her to create a replacement eye for Mei. The Doll's Eye became crucial to identifying the Extra Student.
Parental Neglect: She doesn't know or care about anything Mei does. Nor does she interfere in her life except for certain things.
Replacement Goldfish: Mei was originally meant to be this as she is not her biological mother. However instead the real one is a doll in a coffin that resembles Mei. Said doll represents the stillborn child she never had.
Not Quite Dead: After falling from a two story balcony and being assumed dead he's able to get up and start walking around again with little problem. In the manga at least he suffers a head wound and has to be carried by Teshigawara.
Sanity Slippage: In the anime, he starts killing off other students in a desperate attempt to find the extra.
Ship Tease: Episode 12 hints that he might have had affections for Yukari Sakuragi.
Nice Job Breaking It, Hero: He was the one responsible for letting the countermeasures group listen to Matsunaga's confession, unintentionally leading to the whole school becoming an angry mob against Mei.
Nightmare Fetishist: A mild version. He likes Edvard Munch's "The Scream" because he feels uneasy when he looks at it.
Took a Level in Jerkass: In episode 6, he took the entire art club with him for the sole purpose of keeping them away from Mei and Koucihi who was earlier the second Un-Person. Since said club members acknowledged Mei, it was obvious they weren't part of class 3-3.
Ooc Is Serious Business: Throughout the 3 episodes, she's been nothing but a nice girl, with a lot of questions to ask Kouichi. The only time she ever raised her voice in anger, was in episode 3 scolding Kouichi for mentioning Miasaki's name. This was one of the first clues that tipped Kouichi off that Class 3-3 isn't what it seemed.
Staircase Tumble: Cruel subversion: Yukari didn't die when she slipped and fell down the school stairs... but when she got impaled through the neck with the metal tip of her umbrella.
Ascended Extra: She is existent in both the novel and the manga, just as a completely minor character whose only role is getting killed. In the anime she's not exactly a prominent character either, but at least she gets some action.
Not So Stoic: Episode 11 reveals she's been emotionally unstable since the beach trip, explaining her Axe Crazy behavior in trying to kill Mei.
Not What It Looks Like: When she dies trying to kill Mei. Mei takes the knife out of her hands, just as Izumi walks in. Izumi seeing the knife in Mei's hand and Taokako's corpse; instantly believes that not only is Mei the extra, but also thinks she stabbed and hung Takako.