|Season||Miracle Project Pretty Cure: System REJECT|
|Alter Ego||Fero Nox|
Ferio (フェリオ Ferio?) Ferio is a dragon-like fairy from Märchenland. He helped to create the Miracle Project under the condition that afterwards he would be given a new form to fight alongside the Pretty Cure. Ferio is easily excited and loves to fight, believing that brute force can solve his problems. As Fero Nox, he introduces himself as "
Ferio - Latin for "To kill", representing his dragon nature.
Fero Nox - Fero means "to bring", and Nox means "Night". Fero can also be derived from "Ferio"
Ferio gets his title from his true form, in which he looks like a giant dragon. His wings are so large that they block the sun.
- Ferio is the second fairy to be a regular part of a Pretty Cure team, after Milky rose.
- Ferio is the first fairy to be dragon-like.
- Ferio is the third fairy to come from Märchenland, and the only one to not appear in "Smile Pretty Cure".
- Ferio is the first fairy since "Futari wa" to have a name not based on the series theme or any sort of series related puns.
- Ferio is one of few mascots who do not have a verbal tic.
- Ferio is the first mascot to have black as a primary color.