Hell Girl: Ai Enma

The primary protagonist of the series. With long, flowing hair and red eyes, she is a spiritual entity with a tragic past, who lives in a world of eternal twilight with her grandmother, and is the one who receives and delivers vengeance on her clients' behalf. She normally wears a black seifuku, or sailor uniform (which is usually worn during winter months), but always wears a kimono with floral designs when delivering the vengeance of a client. Ai started her career as the Hell Girl by her own act of vengeance on the villagers who sentenced her to a sacrificial death. Her eyes turned red arguably at the point where Sentaro (her childhood soulmate who gave in under the villagers' pressure to bury her alive) gave the first shovel of soil onto her face. She broke out of her grave after a while, and took revenge on the entire village with her wrath, burning it to the ground. Her task of fulfilling other people's vengeance and ferrying people to Hell is her punishment, a task which she has performed for the better part of 400 years. Although this task is presented as atonement, it is unknown whether she will ever be freed of it. Since she has done this for so long, she initially seemed to have become emotionless, numbed, as is shown by her expressionless face. Wanyūdō noted she still had feelings, though, although she did not express them strongly, and it was later revealed that Ai had been ordered to close her heart by the Spider. The experiences she has with the Shibatas reawakened her discontent with her terrible fate and later apparently reawakened other emotions, or at least Ai's ability to express them. When enraged, Ai demonstrates the ability to hurl great blasts of energy, as well as the power to create elaborate illusions and the ability to teleport

Season 2

Hell girl: Kikuri

An enigmatic little girl introduced in season two, episode 4 and then starts to reappear in season two. Little is known about her except the fact she is not an ordinary human as she can wander freely between the mortal plane and Ai's house in the sunset world, sometimes interfering with her and her companions' job. Her appearance is often accompanied by a lullaby-like background music. In stark contrast to Ai, Kikuri has completely blue/purple eyes (including most of the sclera) and her personality is far more childish (yet much livelier as she has the tendency to pull pranks) than Ai's. She has stated that she likes Ai, but her actions and use of powers seem to serve causing the greatest amount of suffering and fear possible. It is as yet unknown whether this is due to true malice or not. Occasionally, she seems to take delight in acts of low-level destruction, such as chopping off flowers or destroying anything that Ai cares for. She has shown incredible skills with her loincloth, using to catch or hit objects. Despite the fact she appears to wreak havoc on her, she takes orders from Ai and Ai alone (in one episode, she shows this while going to touch Ai's grandmother's spinning wheels despite the woman's protests