I thought his dislike of her affections was a running gag. Is Sonic secretly a Tsundere?
Sonic Team once responded to a Q&A featured in an old Disney magazine back in 2004 that Sonic has feelings for Amy, but he doesn't want to deal with them because he's shy. Not to mention that in both official in-game and website profiles, they almost consistently state that Sonic is nowhere near as annoyed with Amy's advances as he seems to be - so yeah, he's a bit of a tsundere. Also, he not only agreed to go on a date with Amy in Sonic and the Black Knights, but was visibly depressed when she didn't recognize him in Sonic Unleashed when he transformed into a Werehog.
Additionally, one of the more prevalent observations made is that Sonic always seems to slow down enough so that Amy can keep up with him whenever she chases him down, despite the fact that he can easily outrun her with contemptuous ease.
Then there's Sonic X, which was also created and written by Sonic Team(when Yuji Naka was still the head of it), that made the pairing much more blatant than it was in the games. For instance: At the end of the second season, Sonic came straight to Amy's house upon his return to their world, gave her a flower as an apology for keeping her waiting and made a muted statement (in the Japanese version) that made her cry from joy and embrace him. Most fans in Japan have interpreted (based on lip flaps) that he said that he loved her.
And Sega takes quite an influential role as a consultant when dealing with adaptations like the original Archie Comics series and Sonic Boom. In regards to the former, after the Genesis Wave retcon and the release of Sonic Universe, they insisted to Archie to keep romantic relationships ambiguous (meaning no dating/marriage between Sega canon characters, just hints of an attraction). And Sonic and Amy were hinted at quite a bit Post-Genesis Wave. They also persuaded the producers of Sonic Boom to do the same, which is why Sonic's feelings for Amy are more openly mutual, but they still aren't officially together. As mentioned, this is part of Yuji Naka's formula that Sonic can't settle down during the series' run(when the series finally concludes? Who knows), but they still hint at the relationship. Kinda like how Mario and Peach haven't officially hooked up within the games even though the romance between them is obvious.
So, the Sonic x Amy relationship isn't one-sided, but they likely won't become a couple unless Sega decides to put an end to the franchise.
Edited by Kagomaru, 02 March 2018 - 08:37 AM.