Sonic the Hedgehog (Fandom)

Sonic the Hedgehog is a large fandom that consists of games by SEGA and various other media based on them.

Plot
As the Sonic series consists of various different media with separate canons, there is no clear plot. Even the game series contains various spin-offs that don't follow the main storyline.

Games
In the main game universe, Sonic's origins are unknown. He has been an enemy of Dr. Ivo "Eggman" Robotnik for a long time and has saved the world from him multiple times.

Fandom
The Sonic series started gaining popularity in the 1990s (when it was originally made) and it was the Mario series' biggest rival.