The first two are the Forgotten Golden Freddy and Forgotten Freddy, who are just an simple npcs of this game. The last two are the most interesting and important for the game plot. It's the main antagonist and also the final boss of the game of Shadows who always awake and his name is the Shadow, he represents the soul of purple guy, the dark and mean. The next is the main character and his name is Dan. By following the main plot in the gamepage description we can understand that he was a night guard of Freddy Fazbear's pizza location from Fnaf 1. But, after 6 years since the location closed, he decided to use this opportunity as his chance to know why these robots were trying to get in night guard's office and kill him. And he discovered a lot for himself.