Inspired by this stamp[link]
Poor Sonic, he's probably one of the worst victims of shipping wars.
Perhaps he's being paired with a lot of girls over the years in the comics, TV-series and other media (ex. Sally, Amy, Mina, Elise etc.) and he had two scrapped girlfriends (Tiara Boobowski and Madonna).
But I guess is okay for him being single.
Here's some words by Yuji Naka said about Amy marrying Sonic
"There will hardly be any chance, I bet. Amy will continue to pursue Sonic all the time, but Sonic will not ever get married. I think so, because I cannot picture the image of Sonic that he is married and has his children! Also, I feel it is a more Amy's style to always chase Sonic"[link]
So anyway, this stamp for those who like our hedgie going solo.
So let Sonic run free like the wind!
Sonic the hedgehog belongs to SEGA
and Sonic Team