FNaF Headcanons (Mostly Daycare Attendant)

Nightmares

Nightmare Bonnie, Nightmare Chica, Nightmare Foxy, and Nightmare Freddy are fragments of their respective original counterpart's ghost's

Nightmarionne is a fragment of Charlotte Emily's soul

Nightmare Fredbear is actual a fragment of CC's soul

Nightmare isn't a fragment of a soul, but instead a separate entity entirely. He is a manifestation of CC's fears that somehow got a personality of his own. The freddles are in a similar situation.

Nightmare Mangle and Nightmare BB are unknown currently.