Rio/Leo is
Nina's cat and friend. While in his cat form, he has grey fur and green eyes he also has a small black collar around his throat. While in his human form he appears to be a young boy with grey hair and green eyes
The black collar remains on his next and he is generally seen wearing a white shirt or sweater.
Rio has a childish personality and is very happy-go-lucky. He tends to trick or ask people for food. His favourite dish is spaghetti salmon which hints at his true cat form.
