Use Zelda’s down special move to transform into Sheik! Once you do so, you’ll have access to a completely different character.
Sheik doesn’t appear in The Legend of Zelda: Twilight Princess, but we based her model on a design that was drafted up during the development of that game.
Sheik's Special Moves
Standard Special Move - Needle Storm
Side Special Move - Chain
Up Special Move - Vanish
Down Special Move - Transform
Final Smash - Light Arrow