Phoebe Howell is a 9-year-old girl who discovers Marigold the unicorn by (accidentally) hitting her with a rock. Phoebe is a dreamer, and a little lonely because she doesn’t have a friend to make her laugh or to listen to all her extravagant ideas. When granted a wish by Marigold, Phoebe uses it to make the pair best friends, and they go through many fun misadventures together. The friendship between the charming, nine-year-old dreamer Phoebe and the vain, mythical Marigold forever changes both of them for the better.

Marigold Heavenly Nostrils is best friends with Phoebe Howell. Despite being very vain and having a large ego, she is good hearted, kind and friendly. Marigold, like all unicorns, is experienced in magic. Through various spellcraft, she is able to perform such feats as redirecting rain and broadcasting a Wi-Fi hotspot through her horn. Her most frequently-used spell is The Shield of Boringness, which causes humans to view her as nothing out of the ordinary, allowing her to interact with them on a daily basis.