Rouge

History
Rouge might have a tough life stealing emeralds and jewels every hour. She has the ability to fly with her bat wings. In the sonic series, Rouge plays a some what big role. She is a crook who is fond of stealing the chaos emeralds along with Shadow the Hedgehog. She occasinally will help out Sonic and friends. She has shown to have a crush on Knuckles however it might be so she can steal Knuckle's Master Emerald.

Mario and Sonic at the Olympic Games
Rouge was supposed to appear in the game as a playable character alongside Donkey Kong, Silver the Hedgehog and Birdo. She might of been pulled out due to errors with her design. (like Birdo), or due to her clothing be rather inappropriate to young players. She and Birdo are the only ones out of the 4 who have no sign of playable sppesrence in the series yet.