After the death of her parents, a 12-year-old girl named Mia Marconi is gifted a game that her father had made in life, taking the form of a large book called The Legend of Centopia. Inside is magical art and writing and a password, which when read a special way, allows Mia to travel to the magical island of Centopia. In this world, Mia has already met and made friends with some elves and unicorns from the kingdom and with the help of her old friends and some new ones, she embarks on a quest to save Centopia and its inhabitants from the evil toad, Toxor.

Onchao is a white rare unicorn with a golden horn and wings, as well as Mia's best friend in Centopia. Kyara is a pink Onchao's sister, as well as Lyria and Ono's daughter. Lyria ia a white unicorn without wings and is the mother of Onchao and Kyara, while Ono is the blue winged unicorn and was the leader of the Ferngrass herd and was frozen in a glacier by the Ice Unicorn, after a long, tough fight with Panthea, which he lost. After some time his melted out of the glacier by Onchao after the four pieces of his crown were retrieved.

All unicorns are pretty much white and some are colourful which they are huge creatures that maintain the elements of life and are guardians of the balance of nature in Centopia. All of them live in the North of Centopia in a cave deep under the earth, which is covered with colourful trees filled with fruits and leaves and Mo was with his father flying around and speaking to eachother.

King Rainor: Mo, listen to me son you need to spend more time in Centopia. Because when your gonna be the future king after im not here, you will be everyday and all day here. King Rainor said to Mo calmly with his both hands behind his back and looking around the unicorns.