Hanai-yo Shin'ni

Hanai-yo Shin'ni (Hanai yoshinni, はない よしんい), most commonly known as Hanai-yo, is a demon sealed in a Black Demon Series Cured Gear. He serves Sofie Ranami, who has full access to his power and has the ability to call on him for possession. Despite being a possession type demon, he can grant Sofie special abilities, like Asuramaru and Kiseki-O.

Appearance
Hanai-yo takes the form of a slim young male with an androgynous appearance. He has short black tousled hair, and longer bangs fall over his face. Two noticeable features are the pointed black markings under his crimson eyes and the two black horns that sprout from his head. As a former vampire, he also has pointed ears and fangs. Most of his outfit consists of black as well: he wears a tight black sleeveless top with white fur over the shoulders, tight black pants and black knee-length boots. He also wears black arm warmers with silver belts plating his forearms and has a belt around his pants of the same colour. Occasionally, he levitates and has black and dark grey flames forming an aura around him.

Personality
While he usually has a calm demeanour, Hanai-yo also has a flirtatious and seductive character. During her training in mastering manifestation, Hanai-yo attempted to seduce Sofie so that he could drink her blood. Furthermore, during his former life as a vampire, he was quite the womanizer, always seducing young girls and women for their blood. Hanai-yo even says to Sofie that he always enjoyed the company of the "pretty little ones".

He does have a serious side regarding his relationship with Sofie, especially with the things she thinks and dreams about. He appears willing to help Sofie discover the truth about herself, despite a part of him that is reluctant to do so.

Hanai-yo is also quite mischievous with Sofie, teasing her and mocking her every now and again. He sometimes purposefully annoys her for his own entertainment.

Trivia

 * Hanai-yo Shin'ni literally translates into the phrase "there is no good". Since Hanai-yo was once a womanizer, and tends to cause trouble for Sofie during her training, this translation suits him.
 * Hanai-yo's appearance and personality were inspired by Speed-o-Sound Sonic from One Punch Man.
 * Originally, Hanai-yo was called Hanai-yo Shikojin (which is loosely translated as "good individual", as a referance to Sofie), however the translation of his name was meant to suit him as a character, so his name is officially Hanai-yo Shin'ni
 * Hanai-yo's name as a vampire was Yoshin, which means "credit"