List of Hell Girl characters

The Japanese anime television series "Hell Girl", produced by Aniplex and Studio Deen, features a variety of fictional characters that appear regularly among the incidental humans that serve as the subject of each episode. The story focuses on the existence of a supernatural system that allows people to take revenge by having other people sent to Hell via the services of the mysterious titular character and her assistants who implement this system. Some of the humans are able to observe deeper into Hell Correspondence.
Supernaturals.
Yamawaro.
He was a ghostly boy who roamed a mountain but whenever he was seen by humans, he looked like a walking pile of mushrooms. It seems in his time before joining Hell Girl, he looked upon a family by the name of Ashiya. Their son Hikaru had gone missing many years ago. The father of the household was a scientist trying to obtain eternal life. Yamawaro stepped in as their son. Ms. Ashiya accepted him with no worry. Mr. Ashiya, knowing that Yamawaro was obviously not human, used Yamawaro for his "Caterpillar fungus" experiments which still manifests in him till this day. He stated it was "to extend his wife's life". After learning of this, Ms. Ashiya sent Yamawaro away, hoping to spare him from the parasitic experiments at the cost of her own life. She contacted Hell Correspondence to gain revenge on her husband calling it "Hikaru's vengeance". Despite Yamawaro's begging, she pulled the string. Yamawaro watched as the Ashiya mansion swirled away into a cloud of dust. Ms. Ashiya along with it, clutching what seems to be a young boy. This was a key experience to Yamawaro. After Yuzuki becomes Hell Girl, he and Kikuri simply walk away. He is not seen again until The God of Hell possesses Kikuri. After this happens, he returns and helps save Yuzuki from the grasp of The God of Hell by using a powerful supernatural blast. He comes to the aid of Ai again at the end of the third season.
In the fourth season, Yamawaro shows interest to Michiru's existence. Knowing the fate of Michiru to be Ai's successor, Yamawaro decided to be Michiru's assistant and aid her in her tasks. Formerly, he is Ai's fourth companion; now, Yamawaro is the first companion for Michiru.
Michiru.
Michiru is a mysterious young girl who suddenly appear before Ai and her companions in season 4. She does not seem to recall who she is and
where she came from, aside from being a supernatural. Michiru questions the morale of Ai's job as the Hell Girl, and also the ugly truth of human nature. She had a short teal colored hair, jade-green eyes; with a beauty mark below her right eye, and on her neck. Her attire is a long-sleeved green dress, with white leggings that covers her legs.
In Episode 5 of 'Yoi no Togi', Michiru slowly remembers everything about her. Michiru, also known as Sagae Michiru (寒河江ミチル) was the daughter of a man from an electric company in a small town. The son of the landlord (who was influenced by his parents' jealousy), forced her to follow him and his two lackeys to a pond in the jungle. The three boys tried to drown her, but failed as Michiru managed to free herself. However, during the struggle, the ground beneath them collapsed, causing them to all fall in, and Michiru was the only one to survive. After the death of the children, the townsfolk soon turned hostile to her and her family, blaming Michiru for their death; they started to ostracize the Sagaes, to the point that when Michiru went to buy tofu, she was turned away.
Michiru was then deceived by an adult villager to the landlord's grounds, where she was locked away in a storeroom for ten days; which worsen the condition of her mother's health. In spite of being malnourished, she had managed to place a wind chime outside a window through great effort, which enables her parents to find her. However, the villagers found out that they have been reunited; a villager attacked Michiru's father with a crowbar, causing severe injury on his head which kills him instantly. Led by the landlord, the villagers splashed gasoline inside the storeroom, setting them on fire to annihilate Michiru and her parents. Before dying, Michiru's rage had culminated into a powerful grudge that had set fire to the entire village and all the inhabitants. Upon witnessing what she have done, Enma Ai reveals that she has committed an unforgivable sin, one that she must atone for; as the next Hell Girl.
Michiru who was bewildered, refused to accept the role, constantly escaping her encounter with Ai and her companions. Despite her efforts, Michiru always ends up in front of a house that had a wind chime in front of the balcony. The Hell's Crew revealed that it was the work of the Hell's Spider, trying to tempt her into accepting the role. Along the investigation of a client, Michiru slowly got interested and attached with the case; she eventually accepted the Spider's offer and become the successor of Ai, taking the role as the newest Hell Girl. After accepting the role to be the next Hell Girl, Michiru wear a green floral pattern kimono, decorated with multiple large (black and red) roses. Similar to her predecessor, Michiru is able to generate tormenting illusions which will reflect the past sins of her victims. Before delivering them to damnation, Michiru recites her speech;
After the completion of her first task, Michiru had a brief conversation with Ai, saying that her first client will not be able to go to Heaven; much to Ai's confusion. Seeing her response, Michiru stated that Ai does not understand how, or what Heaven is. She once again met with the previous episode's victim, Kazama. Instead of taking his request to take him to Hell, Michiru advises him to not make his parents worry, and smile. She ends their meeting by saying "Let's meet in heaven".
Humans.
Tsugumi Shibata.
In Season 4, she appears in Episode 4, "Bury Me Deep", as an attending staff at Lovely House, a retirement home for the elderly. She states that this is her first job, which calls to question when in the Hell Girl Timeline "Yoi no Togi" takes place.