Officer Big Mac is a custom night unlockable antagonist in the game. What we are looking for his voice is specifically the one from the 70s commercials from McDonald's or McDonaldland with a American accent. On the reboot, he should sound like himself but very intimidating and distorted (reverb is required), as if he is ready to jump at the player at any second. 

For voice reference, me and the team highly recommend this video of various McDonald's commercials from the 70s that features Officer Big Mac here. https://youtu.be/ATy1mUa7BVY?t=157