Hell girl: Hone Onna

 Assistant of Enma Ai, and appears to be a beautiful woman in a kimono with its obi tied in front—the trademark of a prostitute. She becomes the red straw doll when necessary by tossing her red obi strap over her neck. Hone Onna, along with Ichimoku Ren, researches the people who make a contract and the ones they have a grudge against. Hone Onna usually infiltrates human society in casual clothing to investigate cases, on these occasions she tends to use the pseudonym "Sone Anna." On certain occasions, she uses throwing knives as weapons; Hone Onna is apparently extremely skilled with these weapons. Her knives seem to carry some mystic charge, since they can be used to quickly dispatch supernatural enemies. Hone Onna also seems to have some skill as a contortionist, which allows her to squeeze into very small places. Getting out of those same places, however, is an area she is less talented in. Hone Onna seems to suffer from mild vanity; she can be quite offended when she is addressed as obaasan ("old lady" or '"auntie"; a Japanese form of address for any woman of middle age and above). She can expose the bones in her body, scaring the target of the grudge; the name Hone Onna actually means bone woman. In episode 8 of Futakomori she jokingly reveals that she is "200 years old." A flashback scene revealed that she was a Geisha originally named Tsuyu who was betrayed by a fellow Geisha Kiyo when attempting to escape. She was drowned to death under the eyes of Kiyo, a samurai, and her mama-san.

Hell girl: Tsugumi Shibata

Hajime's daughter who often refers to him as "Hajime-chan." She sees Ai one day and has had a mysterious connection with her ever since. At first, she reports everything she sees through Ai to Hajime, but as the series progresses, she becomes more reluctant to do so as she begins to disagree with her father on whether they should try to stop Ai or not.

She is briefly shown in the second season as a source of information for an investigator. At the same time, it seems that she has a similar relationship with Kikuri, which is revealed in the 24th episode of the second season. The third season's 20th episode revealed that she is the medical teacher at Yuzuki's school.

Hell girl:Yuzuki Mikage

 Yuzuki is a girl who has blue eyes and brown hair. Although she has the appearance of a normal everyday girl, she has deep relations to the Hell Correspondence site. Ai chose her to be her temporary body, like a temple. She wants to warn people of contacting the Hell Correspondence, yet, she can't do anything. She can sense the person who will soon contact The Hell Correspondence and she can also see who is contacting Jigoku Shoujo. Yuzuki has a fate to be the next Jigoku Shoujo.

Hell girl: Yumi

She cursed her own twin sister to hell