Lucy/Nyu

Lucy is a teenage diclonius girl around 18 years old. In the anime, she has four vectors with a limited range of two metres, however in the manga, she appears to have many more vectors with greater range. Wihin her two-metre range, she can be swift and lethal, and will use any nearby objects as high velocity projectiles to kill at greater distances. She is also capable of stopping or deflecting most standard ammunition when she concentrates on the task. Lucy has developed strong emotions of hatred and vengeance towards humans mainly because of how she was treated by the humans around her as a child, who made fun of her horns and called her a freak. They said she was "freaky" beacuse she didn't laugh or cry, and so, just to make her cry, they killed her only friend, a stray dog, in front of her. Consequently, she discounts non-diclonii, claiming they are not real people. She seems to lack empathy, kills without much concern, and acts somewhat sadistically, such as tearing off Nana's limbs when she came to retrieve her. Despite this lack of concern for human life she will not harm Kouta.

Nyu is a split personality of Lucy that developed after a .50 BMG round ricocheted off a metallic helmet encasing her head. Nyu has a childlike personality and infantile knowledge of the world, forgetting even that she is a diclonius and how to use or manifest her vectors leaving her a human with horns. She initially lacks spoken language skills; however, she eventually learns a handful of words and phrases. Nyu is innocent and incapable of violent acts, a foil to the normally cold and sadistic Lucy; she is the manifestation of her "good side". When Nyu is attacked violently (or hit on the head), she regresses into Lucy; likewise, when Lucy is treated with love and kindness, she will uncontrollably switch back into Nyu.

Kouta

Kouta is around 19 years old and enters the story when his cousin's family allows him to move in to their closed down restaurant in exchange for maintenance while he goes to a local university. Kouta has repressed traumatic memories of his father's and sister's deaths during his childhood at Lucy's hands. Because of his repressing his memories, Kouta does not remember Lucy from when he met her earlier as a child. Due in part to his loss, he has a soft spot for girls in trouble and is extremely generous and protective to the girls around him. He is more forgiving in the anime, but in the manga when he gets his memories back he truly is unforgiving about Lucy killing his father and sister.

Yuka

Yuka is Kouta's cousin. She is also around 19 years old and planning to attend the same university as Kouta. She moves in with him at the inn after having not seen him in many years. Having had a crush on Kouta since childhood, she is in love with him, and is therefore jealous of Kouta's attention to Nyu, to the point of being very irrational.

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Mayu Professor Kakuzawa Yu, Bandou, Chief Kakuzawa, Kanae, Kurama, Mariko, Nana, Secretary, Arakawa,