Mikan had a harsh life as a child. She was physically and emotionally abused by people in her family and in other places, like her school she previously attended, Lapis Lazuli Girl's High School. Among other things, she mentioned being splashed with water, smeared with mud, and getting burned with cigarettes. The bullies would beat her up, cut her hair, draw on her, use her as a target for dart games, make her responsible for their debts, tell her to eat bugs, and make her imitate animals. She was even told to strip at times. In addition, she didn't have many friends. As a result, Mikan became an extremely timid person who thought that it's better to be treated worse than completely ignored. She feared loneliness and lack of attention more than the abuse and let people do whatever they wanted with her Because there was no one to take care of her wounds, Mikan learned to take care of herself from a very young age. As she became more and more skilled in this area, she took an interest in nursing, realizing that she could have a feeling of control over sick and injured people ー as the weaker people, they would have to depend on her completely and their lives would be in her hands She was later selected as the Ultimate Nurse in Hope's Peak Academy Mikan is an extremely meek, paranoid and fragile individual who suffers from hazardously low self-esteem as a result of severe abuse and bullying. This has resulted in many behavioral symptoms such as being easily intimidated, breaking down and crying with little provocation, profusely apologizing and nervously stuttering while speaking

Hiyoko attended Golden Light Girl's Institute, where it is heavily implied that she never had any friends due to growing a mean and distrustful personality in order to defend herself in the past. She was later enrolled as the Ultimate Traditional Dancer by Hope's Peak Academy. Due to her upbringing under her grandmother's care, she considers herself part of the noble class and everybody else meager slaves. She is also popular with younger audiences, though most of her fans are older men Hiyoko's cute appearance, voice, etc is to give the impression that she is innocent and childlike. Hiyoko is revealed to be cruel, malicious, foul-mouthed and brutally honest. The extent of her cruelty also extends to people, though it is rarely physical presumably due to her diminutive stature. In exchange, she often makes violent yet childish threats to others if they test her patience