Hiyoko Saionji is a character in Danganronpa 2: Goodbye Despair, and her title is the Ultimate Traditional Dancer. Despite her cute/sweet and innocent/childlike personality (and appearance before her growth spurt), Hiyoko has a sharp tongue, crude mouth, and a bitterly nasty attitude. She likes to squish ants or chase around smaller animals for her amusement as if it was all innocent childsplay, stomping on flowers since she claims that she likes to destroy “pretty” things and bully others for her own entertainment. She doesn’t resort to physical violence, but she makes up for verbal and emotional torment towards her victims (her favorites being Souda and ESPECIALLY Mikan), often hurling insults and patronizing them where she knows it’ll hurt because she loves getting a negative reaction out of them. She tends to bully Mikan the most, claiming that Mikan is trying to put on an act for attention - however, she reveals to Hajime that she dislikes Sonia the most because of how much attention she gets from others. Possibly being spoiled as a young girl because she was an heiress in her clan, Hiyoko tends to think of herself on a higher level in comparison to others, manipulating others to get what she wants and will cry crocodile tears if she doesn’t get her way (or genuine tears sometimes, but because of how distrusting she is with the others, it creates a “boy who cried wolf” effect and no one takes her crying too seriously). However, this spoiling also caused her to be unable to do things on her own, such as tie her kimono on her own or bathe by herself. But thanks to Mahiru offering to help Hiyoko tie her obi and spending more time with her, Hiyoko warms up to her and views Mahiru as a “big sis” figure, and also begins to warm up and see Hajime as a “big brother” figure during her free time events since he reminded her of her father.

Her very nasty behavior may have been caused by her past and status as an heiress in her clan (not an excuse for her behavior, of course) - especially because of being raised by an overbearing grandmother and having to deal with people who would play cruel jokes on her or even threaten her life. Because of this, she grew to become very distrustful and wary of others, and her mean behavior is supposedly used as a “shield” to protect herself from further harm (again though, not an excuse for her behavior) and grew to have a fear of being deceived or lied to by others.

Despite all of these negative traits, she can be very level-headed, as she was the first person in her class to accept the reality of Twogami’s murder in chapter 1 and tell the class that they should investigate his death or else they would all die. She’s also extremely condemning of killers, such as condemning Teruteru for killing Twogami, wanting to end the trial once Peko is exposed for being Mahiru’s killer and tearing her down in her “Sparkling Justice” act, and being the only one to call out Fuyuhiko for being directly involved in Mahiru’s murder. But once he does make up for his mistakes and apologizes for his behavior/actions after the 2nd trial, she decides she wants to also change herself for the better for Mahiru’s sake, and tries to be less hostile and mean towards the others. Her development in trying to better her behavior is especially seen in Dr3 Hope Arc, as she even thanks Mikan and becomes more protective of her.

As a remnant, Hiyoko works alongside Ibuki in performing concerts together during the Tragedy to rally the brainwashed army's spirit and recruit more members.

Voices for Reference (ENG): https://www.youtube.com/watch?v=TDR7ZKP7lew 

https://www.youtube.com/watch?v=81JHbxt9d7Q 

https://www.youtube.com/watch?v=7JLbfk57eLo