Amari was born in Papparajuku and is a 10th-grade high school student at Basilico Private Academy. She is a girl who sits at the corner of the class, living a school life where she always seems to be bothered. Her catchphrase is "Amari Katasumi, has been left out again today", and she is a lovely-type idol whose preferred brand is Hysteric Bunny. When Amari was young, it was her dream to become a sparkling idol, and she was very optimistic about it until her classmates laughed at her dream. Now older, Amari tends to always worry about how her peers view her, and she tries to hide her embarrassing things before anyone can find them. She is easily flustered and is a bit skittish and shy. At one point, Amari had somewhat of a dark phase, resulting in her designing Mario.