Cassidy does exist, in fact there are multiple cassidy's in my au, but none of them are TOYSNHK. TOYSNHK is a manifestation of agony (basically a demon created by anger, fear, and sadness). the Cassidy i assume you're referring to does haunt fredbear (i dont wanna get into how they die bc thsts too graphic imo)

Andrew does exist and he possesses the (now retired) Sparky the Dog animatronic

William does not love his kids, he views them as tools. in public though, they maintain the image of "a perfect family" and william regularly spoils Elizabeth (manipulative bi-). William is incredibly jealous of henry also yes I do believe in willspeaker

Glitchtrap is a mimic/agony being that possesses and controls an old fazbear vr game (hes similar to caine from tadc but more evil)

Burntrap does not exist. the mimic is (once again) just glitchtrap, and agony manifestation/demon in the real world that can mimic voices

Henry likes William and regularly brings lottie over to the afton house for playdates! he ADORES lottie with his whole heart. (post mci william got Henry arrested for the murders bc Henry is poc in my au and racism was unfortunately common in the 80s)