Frankie Fazbear is an animatronic in the Five Nights at Freddy's series. He also serves as the main antagonist of the spinoff series, Five Nights at Frankie's. He is the only other character that uses Freddy's personal jingle. Although his a slight remix.
Five Nights at Freddy's 8 (Jiggle Jacob's 2014 Fan Version)
Although Frankie does not appear physically, in the newspaper it reveals that after the restaurant is shut down, they kept the original characters and had plans for a "new animatronic" (meaning Frankie Fazbear).
Five Nights at Frankie's
Frankie finally appears physically in the spinoff game Five Nights at Frankie's. Here he is the main attraction of the establishment, with Freddy no longer being the star or the main antagonist. After the end of the game, Frankie starts acting up and is replaced by a new animatronic named Frankie 2.0.
Five Nights at Frankie's 2
Frankie is still the main antagonist of the sequel, but he is no longer the star of the attraction, as Frankie 2.0, his replacement takes the stage. At the end of the game, due to Frankie 2.0 acting up and Frankie appearing fixed, Frankie takes his role as the star back.
Five Nights at Frankie's 3
The establishment had expanded, with newer animatronics taking the stage. Frankie is back to his role of star and tries to kill the security guard again. At the end of the game, Frankie begins acting up again and is put in the parts room with Frankie 2.0. He is replaced by the newer Frankie 3.0.
Five Nights at Frankie's 4
Frankie is still the main antagonist (although in this game, Freddy seems to take back the mantle of main antagonist on night 5 and above) but is in a state of disrepair and replaced by Frankie 3.0 and is no longer the star attraction. At the end of the game all the animatronics but Freddy, Bonnie, Chica, and Foxy start wrecking the building and the repairs are too expensive to keep the place open and the place is shut down. Frankie, Frankie 2.0, Frankie 3.0, and the newer animatronics are destroyed while the originals are kept.