A butt's ton of Sonic characters in Rouge's outfit. Originally this was just going to be Sonic, then some of the boys, then Amy, then some female characters, and it just ballooned out of control.
From left to right: Silver, Shadow, Tails, Sonic, Amy, Blaze, Sticks, Vanilla, Cream, Marine, Lupe, Sally, Tikal, Shade, Nicole.
I didn't include all of the characters suggested, even though I was getting suggestions out the wazoo, and I didn't include Rouge herself partly because it was too obvious, and partly because I forgot. Also not pictured, Cheese the Chao, whom I also forgot.