Slime Girl is an enemy of Mario, SMG4, and Woody and an extremely annoying one too. She has so far only made once appearance (which is in the New Super Mario Bros. Wii Longplay) but she is set to appear again in a newer upcoming Longplay. She then starts a fight with them and tries throwing Slime at them. She may've tried to win but she lost on both battles. When she exploded, she let Slime out everywhere. She was encountered in World 2 and World 9-4. She also doesn't seem to be allied with any antagonist. She also returned in the Super Mario 3D World Longplay.