The wiki says that Shadow Freddy appears in The Twisted Ones

Sparky, Five Nights At Freddy's Wiki

FNaF: Golden Freddy Explained, and a Comprehensive Analysis of CassidyVictim : r/GameTheorists

Shadow Freddy, Five Nights At Freddy's Wiki

VS OURPLE GUY (Video Game) - TV Tropes

Freddy Fazbear, Five Nights At Freddy's Wiki

Freddy Fazbear, Five Nights At Freddy's Wiki

Five Nights at Freddy's: Fourth Generation / Characters - TV Tropes

Shadow Freddy, Five Nights At Freddy's Wiki

What is a FNaF animatronic you are certain very few people will know? Mine is beacon Bonnie. If you walk into Endo 01 in the foxy help wanted minigame, you will be

Five Nights at Freddy's - Wikipedia

FNAF Easter Eggs to Find - FNAF Insider

The bite victim is shadow freddy (personal theory/semi headcanon : r/fnaftheories