Funtime Freddy's illustration shows the inside of him, with an endoskeleton resembling his game counterpart's. His suit itself is described as withering, its white and pink color fading off into a dingy gray. He wears a top hat and bowtie, his limbs unhinged.
Funtime Freddy is portrayed as twisted and sadistic. He has killed before but is merciful enough to give Millie options of how she wants to die. He goes into detail, describing each method to her and telling her all he knows about it, suggesting he has a vast amount of knowledge when it comes to death and the various ways to torment and kill people. Funtime Freddy seems to kill people solely because he has the ability to do so.
Count the Ways
At an unknown date, Funtime Freddy was abandoned in a scrapyard, for what he claims were "ages". Eventually, he was taken by Millie's grandfather into his garage, where he makes sure Funtime Freddy remains activated.
After an unknown amount of time, Millie decides to climb into Funtime Freddy's torso on Christmas Eve. She hides inside of him to escape the Christmas party her family was having, and Funtime Freddy sets his sights on her, rolling his eyes to peer inside. He claims to know about Millie's infatuation with death and dying, offering to end her life whichever way she chooses, in what he calls a mutually beneficial arrangement. Millie states she doesn't really want to die, but Funtime Freddy laughs it off.
Funtime Freddy begins to list the many ways he could kill her, starting with the suggestion of starving her to death. Millie considers this method, reasoning she could scream for help, but the animatronic replies that his insides are soundproof. He suggests turning off the heaters in his system, freezing Millie to death, but discards the idea as her grandfather checks him often. He also suggests impaling Millie on one of his endoskeleton's metal rods, filling himself with water and boiling it, and decapitation on a thin, sharp, metal piece inside him. He goes into excruciating detail over each procedure, even citing historical events and persons related to some murder methods. During his explanations, Funtime Freddy shows extensive knowledge about many aspects of Millie's life, and reveals his reason to want to murder her being his boredom.
Millie believes she can dodge the blade and sneak out of Funtime Freddy, so she chooses decapitation. Funtime Freddy happily accepts, as it is the one method he hasn't tried before. As he prepares to kill her, she attempts to open his stomach hatch and leave, but he looks back inside before. Millie asks for a countdown so the animatronic bear acts out a French Revolution-like execution scene, blaming her for "crimes against humanity", these being her general rudeness and ungratefulness. Counting to three in French, Funtime Freddy releases the blade from his stomach as Millie prepares to dodge as well as she can.
At the end, it's unknown if he successfully killed her or not.
Room for One More
Funtime Freddy returns as a minor antagonist in one of Stanley's dreams. In the dream, Stanley enters the underground facility only to find it is pitch black. He eventually finds his security office, and upon entering, shines his flashlight on him in the corner. Funtime Freddy opens up his face plates and lunges at him.
Although in Count the Ways, Funtime Freddy kills Millie, the story itself doesn't specify it until Fazbear Frights #11epilogue and leaves an open ending.