Michael Schmidt is the main protagonist of The Return to Freddy's Classic, as well as in the official Five Nights at Freddy's. He is the security-guard of Freddy Fazbear's Pizza working a 7-night shift from 12 AM to 6AM each night, until he was eventually fired for tampering with the animatronics.
Mike's appearance, like the other protagonists, cannot actually be seen, and unlike in the first Five Nights at Freddy's, his body parts can't be seen either. This is because the whole game, with the exception of the minigames, is from a first-person view.
Mike works the night-shift as a security guard at Freddy Fazbear's Pizza, making sure no one breaks into the building during the night. Similiar to FNaF 1, the game is of course, played from a first-person perspective as him.
Since Mike could no longer afford any money to pay his bills, he had no other choice but to return to Freddy's once again after working at the original location twenty one years ago, thinking there would be no more danger, since the animatronics were claimed to have been fixed. However, Vincent later states on Night 2 that his technicians discovered that he animatronics' wiring is messed up, and that they are still broken. So Mike must face off the dangerous animatronics once again...
At the end of Night 7, Mike is eventually fired for the following reasons: tampering with the animatronics, general unprofessionalism, and odor.