There is going to be two new characters for Five Nights at Piggy's: Under Grave- The Spin-off Game. They both are based on new characters in Angry Birds, both the game and the movie.
First Appearance: Angry Birds Pop (2014-2015), FNAP:UG-TSoG
Colors: Golden Yellow
Sharika is a Golden Yellow Angry Bird antagonist that disables bedroom equipment while she's looking at you, same as the Phantom Puppet from Five Nights at Freddy's 3.
She has burnt-like golden hair and had no eyes whatsoever. She has phantom like pupils though.
First Appearance: The Angry Birds Movie (2015), FNAP:UG-TSoG
Leonard is a green pig with green Pig like limbs that helps him walk. He is also the only pig animatronic to have limbs. He appears as a parody of Nightmare from Five Nights at Freddy's 4 as they are both transparent. He has nightmare like eyes with sharp teeth. Like nightmare, Leonard has a jumpscare with one frame and restarts the game.