It depends on what media you look at. In most media, Sonic is in love with Princess SAlly Acorn (that includes the archie comics, Sat. am, the adventures of Sonic the Hedgehog (the Christmas special only) and some pixilized Video Games). But, in the archie world, Sonic has had been interested in other women such as Bunnie Rabbot, and Fiona Fox. But, this has been only on one occation. In Sonic X, his love interist is Amy Rose. In Sonic and The Black Knight Sonic agrees to go out on a date with Amy, but ends up missing it to defeat King Aurthur. In the archie comics, Amy is seen trying to win over his affetions, but, most of the time, fails. But in one issue (during Sonic's breakup with Sally) Sonic and Amy are seen going off on a date (Amy's treat). So, to sum it all up, Sonic's main love interist in most meida is Sally Acorn, but in others, it can be Amy Rose. I hoped I helped!
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Yes, Amy is in love with Sonic.
She fell in love with Sonic The Hedgehog after Sonic saved her for the very first time. (This was back in the Comic Series)
No
It is highly implied that Elise did indeed love Sonic throughout the storyline of Sonic the Hedgehog. Shown through Sonic's Trial of Love, a cutscene where Amy confronts Elise about her liking someone, and most controversially, a scene which Elise revives Sonic through the use of a kiss, telling Sonic to come back to "us".
Yes, he is in love with Rouge.