Bonnie is one of the four main antagonists in Five Nights At Freddy's, he is the guitarist on the Show stage.
Bonnie is known to be Scott Cawthon's scariest animatronic, one of these reasons being he that has no eyebrows.
In the second game, Bonnie is shown to be scrapped and to have no face.
Bonnie sometimes shifts his pupils from white to red and vice versa in FNaF2, so far, there is no answer to this yet. In FNaF 1 Bonnie, along with Chica and Freddy may look at the camera, completely exposing their costume eyes, and stare at the camera in the Show Stage.
Bonnie on FNaF 1 is also shown to be the most aggresive animatronic.
Five Nights at Freddy's 1 Edit
In FNaF Bonnie along with Freddy and Chica will start on the Show Stage. Due to being very aggresive, Bonnie will go try and attack you on the first night. From the Show stage, Bonnie will go to the Dining Area, Backstage, West Hall, Supply Closet, West Hall Corner, then into your office.
Five Nights at Freddy's 2 Edit
In FNaF 2 Bonnie, along with Freddy, Chica, and Foxy will start in the Parts/Service. Bonnie is very active in FNaF 2 just like in the first game. From the Parts/Service, Bonnie will go to the Main Hall, the hallway leading to the Office, then head into Party Room 1. After that Bonnie will enter the Left Vent in order to reach your Office.
Five Nights at Freddy's 3
In FNaF 3, along with Freddy, Chica, and Foxy and the toys. he is a hallway light.