The old withered barely functioning Freddy Fazbear from the 70's. Freddy's trademark classy entertainer voice is corrupted with malfunctions and glitches due to his aged poorly maintained voice box. Even though he's been rotting away the same time as all the others, Freddy seems to be the least damaged out of the four. 

(Don't be afraid to deviate from the given lines and add your own creative touches just as long as they aren't a complete overhaul of the base lines!)