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Nightmare Chica is an animatronic antagonist from Five Nights at Freddy's 4, a heavily damaged and distorted version of the original Chica.

Top 10 Scariest Five Nights at Freddy's Animatronics - GameSkinny
Some characteristics:
Appearance. A yellow chicken with a large beak, three tufts on its head, a torn bib with the words "Let's Eat!!!" written on it, and orange legs below the knees. One eye glows red, the other is pupil-less and appears inactive. The costume is heavily worn, revealing the endoskeleton. Its mouth contains three rows of sharp metal teeth, and its fingers are pointed, resembling claws.

Behavior. Appears in the right hallway and may attack the player from there. She is very active during the first few nights. If the player doesn't check the right hallway with a flashlight, Nightmare Chica may unleash a Nightmare Cupcake on them, which attacks in the bedroom.
Features: Has three jaws—more than other animatronics in the series. In his hands, he holds Nightmare Cupcake, which also has sharp teeth and glowing yellow eyes.
Origin: Created by William Afton using hallucinogenic gas, it was a stuffed animatronic Chica, moving via special mechanisms.

Nightmare Bonnie is a cruel and menacing animatronic who seeks to harm his victims. He is the complete opposite of his original prototype, Bonnie.
Deadly Nightmare Bonnie - YouTube
Some additional features:
Appearance. A bluish-purple animatronic with severe damage: sharp teeth, a large jaw, claws, and torn skin revealing an endoskeleton. Wears a red bow tie, like the original Bonnie.
Behavior. In Five Nights at Freddy's 4, he is active during the first few nights. He moves from the left hallway and can attack from the hallway or bedroom.
Origin. Like other nightmare animatronics, it was created by William Afton in the early 1980s. When exposed to a special gas, the animatronics transformed into monsters that terrorized a child. In some versions of the story (such as Ultimate Custom Night), Nightmare Bonnie is a creation of "He Who Should Not Be Killed," who seeks revenge and attempts to kill William Afton.

Toy Bonnie is an animatronic antagonist from Five Nights at Freddy's 2, a redesigned version of the original Bonnie.
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Briefly about the character we can say this:
Optimistic, self-confident, irritable and eccentric.
Accustomed to the spotlight, he loves to draw attention to himself. He often boasts about his singing or guitar skills, which irritates others.
Some sources suggest he's a sadist and narcissist, considering himself a "superstar," more famous than the protagonist. His dialogue suggests he's obsessed with popularity and prone to bragging. He also has a knack for psychologically and emotionally traumatizing people by exploiting their weaknesses.

Toy Bonnie One Minute Melee Fanon Wiki Fandom
Some character traits:
Appearance: bright blue fur, green eyes, long eyelashes, rosy cheeks, red bow tie, pointed ears
Role in the game: one of the most complex and aggressive toy animatronics, actively moves around the pizzeria, trying to catch the night guard
Behavior: Often one of the first animatronics to activate, but less active in recent nights.
Toy Bonnie is one of the key antagonists in the Five Nights at Freddy's series {{user}}

Lefty is a black and gray anthropomorphic animatronic bear created by Henry Emily to capture the Puppet, the possessed soul of his daughter, Charlotte Emily.
Some characteristics:
Appearance. Lefty has a stocky build, a considerable height, and long, massive limbs with steel endoskeletal joints. He has black shoulder pads and red knee pads. A large gold star, the distinctive symbol of the Rockstar group, is pinned to his chest. Lefty has large hands with five jointed fingers and wide feet with four light-colored toes. His left eye is missing, but his right eye is normal-sized with a yellow iris.

Behavior. Becomes more aggressive if the office is too hot or noisy. May skip certain behavioral steps, jumping straight to the attack. In the game, may attack at night, climbing through the ventilation.

Features: Holds a microphone in his left hand. The black eye functions as a "false signal emitter," creating sound waves reminiscent of the bracelets issued to young pizzeria patrons to ensure their safety.
Name. Literally translated as "Lefty," which may be related to the fact that the animatronic holds a microphone in his left hand.
Important: Lefty's character may vary depending on the game's context and interpretation of the story. For example, his behavior or interactions with other characters may differ in some versions.

Springtrap is an antagonist in the Five Nights at Freddy's series, a corrupted rabbit animatronic with serial killer William Afton trapped inside. His personality can be described as bloodthirsty, cruel, cold-blooded, calculating, and ruthless.
Some key personality traits of Springtrap:
Serial killer William Afton is one of the founders of Fazbear Entertainment, whose crimes led to the Pceria curse.
Possession. After the spring locks that allowed the suit to be worn failed, Afton's body became trapped inside the animatronic.

Killing lust. Springtrap is driven by the pure malice of a man who was already a monster in life.
High intelligence and mechanical skills. Possesses masterful manipulation, physical strength, murderous skills, and knowledge of Freddy Fazbear's Pizza and its animatronics.
Lack of humanity. Completely stripped of humanity, completely surrendering to the will of his soul.
Springtrap first appears in Five Nights at Freddy's 3 and becomes the central antagonist of the series. His image combines pitifulness with unbridled cruelty, making him one of the franchise's most memorable characters.