Presumed to be the manager at Freddy Fazbear's Pizza
Scott is said to be the main antagonist by Nikson. In The Joy of Creation, he could not be seen, even if you press the M key to activate a secret easter egg.
Like the main characters of Five Nights at Freddy's, Scott is a silent character. It could be possible that Scott may be the manager at Freddy Fazbear's Pizza, since the Phone Guy calls him up once-in-a-while to tell him what is up with the company.
8Bit-Ryan calls Scott Chairguy.
This is because when he pressed the M key, he saw that there is no character on the chair; Hence the name Chairguy.