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- Voiced by: Yuuki Kaji
- Catchphrase: "Zaregoto da." Translation
- Mystery Magnet
- No Name Given: His real name remains unknown to the reader but several people in-story do know it. It is said only Kunagisa and his sister ever called him by his real name. There is a riddle he told Hagihara Shiogi in Hanging High School. Shiogi solved it, but the reader never learned the answer.
- Only Known by Their Nickname: The nickname Ii-chan is usually used by Kunagisa and Omokage Magokoro. Other people called him by various nicknames such as Ii-kun, Ii-tan, Ii-ni, Ii-nosuke...
- The Stoic: Regardless of what he's feeling at the moment, his face will betray no emotion whatsoever.
- Unreliable Narrator
- Wholesome Crossdresser: In Sumiyuri Academy he was forced by Aikawa Jun to wear Girls' Uniform.
- Voiced by: Aoi Yuki
- Ambiguous Disorder: Kunagisa has some non-specified mental problems making it hard for her to travel alone. This is why Ii-chan accompanied her to the Wet Crow's Feather Island in the first place. It is mentioned that there are three restrains, but only one was mentioned: she can‘t move vertically (i.e. stairs or elevators) without the presence of other people.
- Bunny-Ears Lawyer
- Idiot Savant: Kunagisa has been diagnosed with Savant Syndrome, she's unparalleled with anything involving computers, but helpless in many day-to-day activities.
- Kissing Cousins / Brother–Sister Incest: Her parents are implied to be such. It may or may not the reason she has blue hair.
- Lonely Rich Kid: She owns the whole apartment she lives in, and her family is one of the most influential in Japan. On the other hand, Ii-chan seems to be her only friend.
- Names to Run Away from Really Fast: Dead Blue, her nickname as the leader of Team. She is legendary in certain circles.
- Older Than They Look: She is said to have remained the same after Ii-chan left for America. That would imply that she looked like 13 when she was 19. At the end of the series, she began to grow again.
- You Gotta Have Blue Hair
- Voiced by: Yuko Kaida
- Action Girl
- Brother–Sister Incest: Her Parents.
- Don't Call Me "Sir" - Only her enemies call her Aikawa-san, but Ii-chan does it anyway.
- Has Two Mummies: Has three dads: Saitou Takashi, Kajou Akira and Aikawa Junya. Saitou Takashi is her real father, the other two were his friends and collegues.
- Insufferable Genius
- Names to Run Away from Really Fast
- World's Strongest Man: Subverted. She is only said to be humanity's strongest contractor. But she did beat Omokage Magokoro at the end of Uprooted Radical (Part Three), who should be the strongest human being.
Wet Crow's island
- Voiced by: Mariya Ise
- Angsty Surviving Twin: Subverted. She killed her twin sister herself, which is the reason she has been exiled to the Wet Crow's Island in the first place.
- Lonely Rich Kid
- Theme Twin Naming: Her name is from Iliad while her sister Odetto's name is from Odyssey.
- The Ojou: The Akagami family is one of Japan's five biggest plutocrats.
- Voiced by: Houko Kuwashima
The Chiga Triplets: Akari, Hikari and Teruko
- Ninja Maid: Teruko. She can even fight off Zerozaki Kishishiki to protect her mistress, Iria.
Sonoyama Akane the real (fake) Ibuki Kanami
- Voiced by: Yu Shimamura
- Kill and Replace: What she did to Ibuki Kanami, Sonoyama Akane and all her other unnamed victims.
Ibuki Kanami the real Sonoyama Akane
- Voiced by: Ayako Kawasumi
- Voiced by: Kenji Hamada
- Voiced by: Aya Endo
- Voiced by: Haruna Ikezawa
Rokumeikan Private University
- Japanese Delinquents
- Punny Name: Muimi means meanningless, her sister's name Muri means unreasonable, rude.
- Family Theme Naming: Shiki for the male and Ori for the female.
- Serial Killer: That is the reason they are a family in the first place.
Zerozaki HitoshikiReal name Migiwame Toshiki. The son of two Zerozaki, Zeroshiki and Hataori, which makes him the only "born" Zerozaki. Raised mostly by Soushiki, the only person in the Zerozaki clan that Hitoshiki recognizes as family (at least before Iori came along).
Mutou Iori/Zerozaki Maiori
- Ambiguous Disorder: Due to past injuries, she has some speech problems and even some intellectual damage.
- Cute and Psycho: She is mentally unstable, which is the cause of all the problems in The Kubitsuri High School.
- Repetitive Name: Almost. The characters of 萩"hagi" and 荻"ogi" are look-alikes.
Niounomiya Rizumu and Niounomiya Izumu
- Raised as the Opposite Gender: Implied. Although it is more mental than physical, since Izumu stil wear women's clothes and has long, dark hair.
- Transgender: Izumu identifies himself as male.
Furuyari Zukin the 12th
- The Blacksmith: The name Furuyari Zukin is a title she inherited from her grandfather (the 11th) who was a blacksmith. It has been passed down in the family.
- Muggle: She is really just a normal high school girl.
Ishimaru KoutaJun's friend
- Phantom Thief: Although we never see her in action.