Scourge. Canonly, Scourge the Hedgehog is a self-centered, arrogant jerk. And that's why I like him! But he's everything bad about Sonic...multiplied by a hundred.
My fan-couples are ideal for the future. So in the future that I came up with, Scourge is a bit nicer. Fiona, his canon girlfriend, betrayed him again because he wouldn't do what she said. So, once he was over the shock, he hightailed it back to Mobius Prime, where Amy Rose was moping about Sonic. Then she got an idea. She would make Sonic jealous and win his heart! She chose the person that would make him most jealous-Scourge-and tracked him down. Once she found him, he was a different person. He had stopped chasing after any girl he could get ahold of, and wanted to stop liking girls, period. But Amy charmed him, and it worked. They went on a few dates, and one day Amy was walking down in a bad part of town and heard Scourge with Mephiles the Dark through an open window. First, Scourge talked about "using" Amy to get back at Sonic. Amy was angry at him without thinking that she had been trying to use him for the same goal. Then Scourge mentioned falling for her, and Amy was terrified. Scourge couldn't be in love with her. No. Not possible. She couldn't.
But they went to prom, and...well, I wrote a fan-fiction about it that's up on the fan-fiction page.Check it out, it will explain all. Like how Amy got arrested for aiding and abetting a criminal. And how Shadow turned them in and unwittingly turned himself in. And don't forget the attempted escape via Jell-O. Oh... I shouldn't tell you that, you'll read it in the story? Whoops. Sorry.