Yuki

Yuki is a pleasant half-demon, however is known to struggle with some sort of insanity, being constantly haunted by a supernatural character known only as "Maria".

Biography
Yuki is half-demon, half human, with a penchant for getting into trouble. She is haunted by a figure named "Maria", who she seems to have a past with. She attends Baku High School in her series "Once Upon a Yandere", where she meets Static, who becomes her obsession - her "Senpai". After being rejected by him, she decides to leave him alone, contrary to the typical manner of a Yandere.

After more adventures, such as joining the delinquents (The "Defence Club") and trying to win over another boy - Max, Yuki and the other students are relocated to Moncher High School by Principal G., as it turns out Baku High School had actually been shut down years before.

At Moncher High School, Yuki meets a new range of characters, and makes friends with many of them. She meets extravagant teachers who have varied opinions on her, and gets into a relationship with her previous enemy Mewbone which lasts several episodes, before ending catastrophically.

On episode(s) #87, #88.2, and #89.2 of "Moncher High School", Yuki loses her sanity after the camping trip and kills almost everyone in the entire school. Which resulted in her going to prison without Eyeball and having Maria with Yuki in her cell until Maria can reproduce her powers so she can teleport as she used to before.

Behind the scenes
Amy (Yuki) enjoys her time with her mother which Amy (Yuki) said in a video named "I was in FOSTER CARE? (Announcement)" that she didn't spend enough time with her mother but still loves her mother dearly.