Nightmarionne loves singing, and is actually good at it when he's not trying to be bad on purpose to annoy people.
Which is always, so the other nightmares never heard him actually singing.
Legend has it that the nightmares still cant figure out who was singing The Other Side from The Greatest Showman by himself at five am.
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FNaF Headcanons (Mostly Daycare Attendant)
RandomJust some of my FNaF headcanons, nothing special