The Medusa (Kid Icarus) did not originate from fanon, and more information can be found on their respective wiki(s). You may read more about 1 on the following wiki(s):

Full Name Medusa
Gender Female
Species Demon
Current Status Unknown
Class Villain
Main Weapon(s) Rod
First Appearance Kid Icarus
Latest Appearance Kid Icarus: Uprising
Medusa is an evil goddess and is also the main villain of the Kid Icarus series. She rules the Underworld and wants to take over the earth as well as Skyworld.


Kid Icarus: Revelations

In the beginning of Kid Icarus: Revelations, Palutena is kidnapped and Medusa is the prime suspect. Later, it is revealed that Medusa is innocent.