Considering this is a UCN game, and I don't exactly have experience with advanced FNaF fangames, I feel like a team of 8~10 people, including me, would be a good idea.

Possible roles listed below.

Mechanic Ideas - Minor Role. Looks over abnormality mechanics and finds out how to translate it to a FNaF mechanic.

Easter Egg Ideas - Very minor role. Suggests Easter Eggs and references to add to the game.

Voice Actors - Major Role. For any matter involving voices.

Coder - Major Role. Helps code. Don't need anymore

Artist - Major Role. Helps with backrounds, cameras, etc

Music - Major Role. Helps with audio and music

Friend to be a part of the game. I'll add everyone to a groupchat.