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A girl whom Kanta tried to save, she is very easy-going. She wanted to meet her father no matter what, but her mother is so overprotective of her that she forbid her to meet him and even chauffer couldn't bring her to the house of her father. She made an agreement with chauffer that she will find a boy who could save her from fake kidnapping so that she could visit her father during that time.
A little girl who stopped speaking after her mother, Dinah, died. Her father is a Topsider. Mana is from Amaurot, a town in Agartha.
The family pet of the Niwa family and Dark's familiar spirit, With responding to Dark's call no matter where he is and transforming into a black, winged creature that becomes Dark's wings by clinging to his back. He can also perform other transformations, and can turn into Dark or Daisuke, but is not very adept at communicating verbally. For example, With's attempt to say "Daisuke" comes out as "daisuki" (lit:I really like (you)). Wiz does not like learning new words as well. With resembles a hybrid of a dog and a bunny (the closest animal Daisuke could compare it to was a lop-eared rabbit), and it is unknown how old With is. In this form, With normally says "Kyuu." He hates water, is afraid of scary movies, and hates Krad. In the English manga translation, With is known as "Wiz", or "Wizzy." With is the Japanese version, Wiz being the English manga version.
An immortal companion of Yuta. She was raised by a group of old women that kept her captive and incapacitated in a hut. They were really mermaids that sought to eat Mana once she reached her adolescence to regain their youth. She travels with Yuta since, and possesses a large sense of loyalty and feelings towards him, but due to her somewhat naive and spoiled nature, she doesn't seem to truly realize that her emotions towards him are possibly love or just simple affection.
