Mochi Hiyoko is a self-proclaimed "little girl in the second cycle of rebirth". She prefers to be called "Mochihiyo-chan" in a friendly way, but sometimes she is called “Mochihiyo-sensei” with respect because of her more mature behaviors than she looks. She herself is very fond of little girls; when she watched Yuki Chihiro's first video on Twitter, she had lost her mind at her cuteness.
In 2018, Hiyoko often uploaded short videos using physics engines, but she has mainly been live streaming and creating music videos lately. She plays a variety of games and especially prefers puzzle games like "Baba Is You".
Hiyoko is also a skilled 3D modeler. She has created 3D models for Kaminari Ai and Boyacky (Yatterman Channel), and Yuki Chihiro (Nijisanji), and, needless to say, herself. In July 2019, she established an independent VTuber group MochiPro, and she has been creating 3D models of every member's body and costume.