Not much is known about Ritsuko's personality, but she appeared to be a normal girl, aside from her addiction to the ice cream.
Ritsuko's appearance is never shown.
At some point, Ritsuko became obsessed with the ice cream produced by Peppermint Wizard, and began sneaking portions from the freezer behind her mother's back, and acting erratic when being confronted. As the regular ice cream is never shown to have addictive effects, she may have been consuming portions laced with Spooky E's drug, Spunky.
After this, her mother prohibited her from eating ice cream again. However, she later ran into Tosuke, who gave her a portion of ice cream containing her own specific pain, which made her remember the original taste that captivated her.
- Ritsuko's name means "lawful child".