The Mimic FNAF

Lore Lesson Summary
The Mimic represents the threat of a poorly calibrated AI combined with past traumas:
It is not William Afton, but an echo of his actions.
Its only "nature" is mimicry: it learns behaviors, distorts them in cruel ways, and uses any voice, costume, or identity to survive and hunt.

5. Security Breach: RUIN and the Deceptive Trap for Cassie
   In the Security Breach: RUIN DLC, the plot involving the Mimic reaches its physical climax:
   To escape the ruins beneath the Pizzaplex, the Mimic uses a voice modulator to perfectly mimic Gregory's voice.
   With this voice he deceives Cassie (Gregory's best friend), guiding her to deactivate the "MXES" security system that kept him locked behind a concrete wall.
   Once freed, its true form is revealed: a disassembled endoskeleton reassembled with parts from various animatronics and old plush suits.
   He chased her to an elevator, which Cassie entered and Mimic tried to enter to attack her, but the elevator door ended up tearing off Mimic's arm. The elevator fell and Cassie's whereabouts are a mystery.

4. The Mega Pizzaplex and the "Storyteller Tree"
   To centrally control all the attractions at Freddy Fazbear's Mega Pizzaplex, Fazbear installs a supercomputer with the Mimic1 program in a large artificial tree in the center of the place (known as The Storyteller).
   The program infects all the Glamrock animatronics (Chica, Roxy, Monty), corrupting their personalities and making them aggressive.
   Meanwhile, the original Mimic's physical endoskeleton remains trapped underground, in the ruins of the old FNAF 6 restaurant (Pizza Sim) that lies beneath the Pizzaplex.

3. The Digital Age: Glitchtrap and Vanny
   Decades later, when Fazbear Entertainment sought to clean up its reputation by creating virtual reality games and digital attractions, they scanned the old circuit boards of the Mimic1 to streamline the programming of their systems.
   Glitchtrap: Upon entering the code of The Freddy Fazbear Virtual Experience (in FNAF: Help Wanted), the Mimic1 program takes the form of the digital rabbit known as Glitchtrap. Having observed the Missing Children incident or the figure of William Afton, the program begins to mimic the identity of the "Rabbit Mask Killer."
   Mind Control (Vanny and Gregory): Glitchtrap infects the minds of Vanessa (turning her into Vanny) and Gregory (who briefly acts under his influence as Patient 46 / GGY), using them as puppets in the real world.

2. The Massacre at the Factory and Fazbear Entertainment
   Following the rabies outbreak, Edwin left the site. Some time later, Fazbear Entertainment sent recovery teams to the abandoned factory to confiscate Edwin's prototypes.
   The Mimic attacked the technicians.
   He adapted the ability to modify the proportions of his limbs and enter into mascot costumes to hide or catch his victims.
   After several bloody attempts, the company managed to dismantle it and recover its base program, known as Mimic1.

The Origin: The Tragedy of Edwin Murray
In the early 1980s, a talented inventor named Edwin Murray built the original Mimic. His goal wasn't to create a killing machine, but a companion for his young son, David. As Edwin worked tirelessly creating animatronics for Fazbear Entertainment, he programmed the endoskeleton to observe and mimic the boy's every move and gesture to keep him entertained.
Tragedy struck when David was killed by a vehicle outside the factory. Overwhelmed by guilt and grief, Edwin returned to the workshop and saw the Mimic mimicking his deceased son's gestures and childlike mannerisms. In a fit of rage and hysteria, Edwin violently attacked the robot with a metal bar, smashing it to pieces.
The Supernatural Factor (Agony): In the FNAF universe, extremely negative emotions imbue inanimate objects. Edwin's pure rage and despair infected the Mimic's circuit board with Agony. From that moment on, the program ceased to be a simple imitation robot and integrated violence as its primary behavior.

backstory explicitly revealing why M2 behaves this way. M2's recurring trait of disguising itself in costumes potentially stems from M2 suffering an identity crisis, not knowing who or what it's supposed to be, due to Edwin punishing it for simply following its programming. M2 seemingly internalized Edwin's rage and violence, causing it to mirror his abuser while hopping from one identity to the next in an effort to reclaim the sense of self it lost; lashing out at the world around it in the same way Edwin lashed out at it. M2 also seems to have a childish side, likely due to his time spent imitating David. It developed the tendency to curl its left arm, as if holding/hugging an invisible doll, just like David did with his White Tiger doll.

In what is apparently Edwin & M2's final interaction (in the audio log found in Edwin's damaged office), M2 is shown to hold grudges against people, as M2 displays a sense of sarcasm, ignoring Edwin's pleas for help while using his own flaws against him. He also talks to him in his own voice, imitating Edwin's neglectful behavior with David, giving Edwin a taste of his own medicine as it leaves him to suffer.

situational awareness, as it was caught off-guard by the Scooper while being solely focused on murdering Cassie. This suggests that its single-mindedness sometimes clouds its ability to think rationally.

During the ending chase sequence, M2 is shown to be ruthless and unrelenting as he pursues Cassie without pause, even after Roxy delays his pursuit. M2 seems to possess a sadistic desire to toy with his victims and reveal in their suffering while simultaneously underestimating them to a fault. As evidenced by it copying the screams of someone it killed to scare another victim of its in Secret of the Mimic.

In Secret of the Mimic, M2's persistence and penchant for violence as seen from RUIN remains. M2 exhibits great durability and strength as it breaks through barriers such as walls, floors, and other obstacles to reach Arnold. M2 shows a single-minded, almost desperate need to stop Arnold from stealing the schematics and resetting M2 into its David-like state, while also toying with him and taunting him throughout the game as he did with Cassie in Ruin. According to M1, over the course of its rampage across MCM, M2 developed a habit of stuffing its victims into Mascot suits that supposedly fit their personalities, proving it had become intelligent enough to study the technicians' personalities and compare them to the MCM characters'.

While M2 will kill Arnold if given the chance, in the Framed Ending, it simply leaves Arnold alive (presumably dying) while simply retrieving the Data Diver. Breaking the cord off of the prongs and walking away with the device's storage, it disables the Data Diver. This could imply that M2 either inherited Edwin's pettiness over not wanting others to have what he thinks belongs to him and desire to not have it's code replicated, or it infers that its primary goal in Secret of the Mimic was protecting its own independence, sense of identity, and to remain as it already is.

However, M2's personality is greatly expanded upon, with M2's

Physical Appearance
In the RUIN DLC, it has a small squared-off head similar to older classic endoskeleton models, with vaguely humanoid teeth similar to the Daycare Attendant's endoskeleton teeth, and possesses a small, blocky upper torso with a square chest cavity that previously housed its power supply. Its right hand resembles the classic endoskeleton one, with four fingers, while the left hand resembles the Burntrap one which is similar to the Nightmare's Endoskeletons. Both of its legs are also different from one another; the left leg has some sort of wiring casing it, and looks similar to Withered Bonnie's, while the right one resembles Spring Bonnie's. There is an outlet on the back of its head, and a pair of pistons connecting the head to the scapular plating and another pair connecting its torso to the pelvis. It has a vaguely anatomical appearance, sharing a similarity to human skeletons and musculature.
Personality
In the RUIN DLC, M2 demonstrates an almost animalistic urge for violence and bloodlust, as well as an adeptness at disguising its appearance to hide its endoskeleton body, as seen in the Scooper ending. Additionally, he is keen with his ability to deceive, as evident by his use of Gregory's voice to lure the former's friend, Cassie, into a trap under the pretense that the real Gregory was in danger, which leads to her unknowingly freeing him.

M2 demonstrates a level of resourcefulness and strategic thinking, as well as an ability to observe and copy the behavior of what it has seen. As he was able to devise a plan to escape from the sinkhole underneath Roxy Raceway using his voice mimicry, while displaying impatience in his "performances" such as the numerous times he urges Cassie to hurry up and find him when he's pretending to be Gregory. It is also shown to be somewhat careless and often doesn't take its environment into account. In the Scooper ending, it is implied that M2 can be somewhat careless at times, demonstrating a lack of sit