Arizo

Arizo is a deceased middle-school girl who haunts Astral Academy's grounds. She died 15 years prior to the story. In Astral Academy's sequel, she attends the school as a zombie (courtesy of Cian).

Appearance
Arizo has messy, long gray hair, a small bottom part of it being in a ponytail. She wears a tattered, grayscale, and stitched-up version of her middle school's uniform, which is too big for her. Her skin is gray and her eyes are dull.

Background
Arizo was born in a normal family and lived life as a normal girl. She was born with caramel brown hair that reached the top of her neck. She was known for her exceptional grades.

There was a day where her teachers let her have a free day, but her parents wanted her to ask them about an assignment. So she walked to school all by herself to ask them about it. When she opened the door, she was greeted with a huge gust of wind, which caused her papers to fly off. While she ran inside to try and get her papers, the powerful winds threw her into the wall. She attempted to get up and escape, but by the time she got the power to stand up, Sayu had walked over to her. He mocked her and mimicked a speech she did in school before stabbing her in the chest, stomach, and throat.

When she was announced as one of the victims of the middle school's tragedy, her parents were heartbroken. Her funeral was held a few days after. When she was revived as a ghost, she held resentful feelings towards Sayu and the reason why she lives in Astral Academy was to haunt Sayu forever.

Plot Role
She was introduced in Chapter 4, where Asahi was helping a lost Zenya find his way through the school. The two boys accidentally bump into her which causes her to let out a scream. Asahi apologizes over and over to her while Zenya sat there, stunned. Realizing she startled them, she introduces herself and then fades away again.

At the end of the story, Cian turns her into a zombie, which enabled her to leave the school with the others and see her parents again. She spends time with them until August 1, a week before the start of Astral Academy 2. This is when her younger brother, born a year after she died, returns from a summer vacation. He got an invitation to the school via his parents.

In Astral Academy 2, she is a first year in Dorm A along with her brother Rizen.

Kurunu Sayu
Arizo despises him and distances herself from him in the sequel.

Ashikage Cian
Cian is the person who revived her as a zombie. She's grateful. They meet up a lot since Arizo's makeup falls off often and shows her zombie skin. Arizo also sees Cian as a genius.

Trivia

 * She takes care of a white cat that lives outside the school.