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?

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In Five Nights at Freddy's 5 we all come to know that there are 5 animatronics, but there was one animatronic that we come to know later on that was never included. Why did Funtime Chica never appear in Five Nights at Freddy's 5?

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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?

I AM NOT A MORON

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

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

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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?