Soneach

Soneach is the het ship between Sonic the Hedgehog and Princess Peach from the Super Smash Bros. fandom.

Canon
Sonic the Hedgehog and Princess Peach met each other in Mario and Sonic at the Olympic Games series and Super Smash Bros. series, starting with Super Smash Bros. Brawl.

They have many differences in personality- Sonic fights against hordes of robots while Peach usually gets kidnapped by Bowser.

Fanon
In Mugimikey's video Sonic Meets Mario Mario found out that Peach is dating Sonic, thus making plumber in red jealous and furious. Peach also called Mario "Red short Luigi" here. Sonic kept taunting Mario by playing with Peach's buttocks and boobs. Thus Mario broke down and Sonic reassured him and suggested plumber to date Bowsette.

Fandom
FAN FICTION

Trivia

 * This pairing is very similar to ClouZel, since it is about former console-exclusive mascot dating a Nintendo princess.