User blog comment:Sonicthehedgehog16/Sonics relationship status/@comment-477304-20130507220411

Depends on the continuity:

In the games/Sonic X: Amy, but fans will argue 'till the cows come home if Sonic has any genuine romantic feelings for her.

In Archie comics: Sally, the two have been a couple, and various possible futures show them to be married with children.

In Sonic the Comic: No-one, Sonic's a jerk in that series. Amy still seems to show some interest though, but not as nearly as much as other continuities. She's too busy shooting Badniks with her crossbow.