What was the first known fan-made character back when Five Nights at Freddy's was first released?

Why does Scraptrap from Five Nights at Freddy's 6 look oddly different from the Springtrap we're all used to in Five Nights at Freddy's 3?

Who is Yenndo from Five Nights at Freddy's 5, and what is his purpose in the storyline of Five Nights at Freddy's 5?

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Why does Nightmare Foxy from Five Nights at Freddy's 4 convert into a plushy when you check on him every time?

I AM NOT A MORON

Why, in Five Nights at Freddy's 6, does Molten Freddy's voice resemble that of Funtime Freddy from Five Nights at Freddy's 5?

What is Plushtrap's origin?

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Is it possible that Golden Freddy was still around in Five Nights at Freddy's 3 while the other animatronics became phantoms?