Hell Girl

Wanyudo  

He is the first of Ai's allies. He appears to be the old man whose eyes remains shut. He also wears a traditional yukata with a long sleeved haori. In the first season of hell girl he is always used as the black straw doll given to the clients. He regularly also takes the form of the coach with a burning wheel that takes Ai whenever she goes to human world to claim a soul.

Wanyudo's name is taken from the "yokai" of the same name which means "A wheel entering the road". Actually, Wanyudo is a princess' entourage carriage that has fallen into a cliff, it got caught into a fire and all its passengers that time were killed. As a result he became a flaming wheel-formed yokai terrorizing people with his own enlarge face showing off as a hubcap.

Eventually, he met Ai and she invited him to join her as her first companion. He revealed to Ai his ability to shape shift.

Ren Ichimoku

Ren is Ai's second recruit to be her companion, he appears to be the handsome young man who has her hair covering his right eye. He has the ability to project his eyes anywhere he wants which is useful when they are tracking their client. He also has this ability to let out a very bright light in his eyes when he is fighting that could easily blind or weaken his opponent.

Ren is actually a "tsukumogami", a type of spirit that came from an artefact which has been used or existed for a long time already. Ren is actually a katana, Ai found him near a rock after his owner got slain in a battle.

Hone Onna

Onna is the third and the female companion of Enma Ai. She takes the form of a beautiful and stunning woman wearing a blue kimono. Onna and Ren usually are the ones who investigate the clients because they can easily blend with normal humans.

Honna Onna means "bony woman", which is also one of her special ability to show off some of the bones in her body which is used to scare off their victims. She can also use her bones to inflict pains in their victims.

Onna's real name is Tsuyu, a geisha who was murdered by a yakuza and thrown into the river where she became a yokai named Hone Onna. Her story started out when the first man she loved betrayed her and sold her to bothrel in order to get money to pay his debt. After that her friend a fellow geisha betrayed her again which lead to her murder as well as the assassination of the man she loved in the hands of a yakuza.