This mod allows you to switch characters by holding buttons on the
controller while loading a level. Controls: Left - Sonic Right - Shadow Down - Knuckles Up - Rouge R - Mech Tails L - Mech Eggman Y - Tails X - Eggman B - Alternate Character (Amy, Metal Sonic, etc) A - Alternate Costume Hold Start on player 2's controller to force them to spawn in 1P stages.
This mod has a bug. It prevents alternate characters from being used in multiplayer, causing the main character to be loaded instead. For example. Knuckles is loaded instead of Tikal, Rouge is loaded instead of Chaos Zero, and Sonic is loaded instead of Amy.