Hiyoko's cute appearance, voice, and (initially) her way of talking give off the impression she is innocent and childlike. However, in her introduction alone, it is quickly revealed that she is very direct and cruel with a malicious side. Because of Hiyoko's past, she considers herself part of the noble class and everybody else meager slaves. She constantly judges others and patronizes them with rude insults, with Mikan and Kazuichi being the most common, as well as the easiest victims. If she doesn't get what she wants or if other people actually talk back to her, she tends to cry crocodile tears loudly like a child, though her tears are sometimes genuine. But after the events of Chapter 2, Hiyoko attempts to change herself for the better, trying her best to become less hostile and insulting, and understanding.

Her official English voice actress is Kira Buckland.

Her voice should be high (I'll also accept mid-high) and childlike. She  should be able to cry big, but should also be able to sound rude and condescending.