![](https://cdn.animecharacters.io/images/characters/large/281-ccbc8069.jpg)
Rio (リオ)
Nina's pet cat, Rio (called 'Leo' in the English translation of the manga), can change into the form of a little boy, with a magic candy. In the anime, all he has to do is a flip and he becomes human. In the anime, he starts to like Ayu's dog, Tamako. (Source: Wikipedia)