Corrupti Incident

Before the incident, on the island, some of strange costumes started appearing and coming to life. They were friendly to the employees and seemed to understand the island in a similar way to them, so they were allowed to roam the place during the night despite their strange behaviors. One day, a photo-negative Mickey costume accidentally wandered around one of the attractions during the day. Mass paranoia struck when he decided to pull on a show, removing his head for everyone to see. During this incident, numerous people were injured and a select few killed.
Jake Smith, a young child at the time, gets ensued in the chaos, and once the dust settles and everything is under control, he finds his mom and dad dead in the Meat Freezer. He thought the suits killed them, so he angrily attacked them, beating the Photo-Negative Mickey with a sign, threw one into an outdoor fire where he melted, beheaded one, beat one with a skull which was hidden under one's head, cut off the arms of three of them, grabbed a hook and gouged one's eyes out, and punched one in the jaw. One toon was mutilated with a cleaver. Ultimately, the culprit for the madness and suffering was a vengeful demon, who wanted to cause as much pain as he felt for too long.
There's another story about this incident, where it's the rise of Scoiling Mouse, and the death of Jack: **Scoiling Mouse**, (one of the spare, hidden/resented and rotten **Mickey Mouse** suits/toons) was just an employee of the SSA, of the closing/closement, abandonment of Treasure Island, under the name "***Jack***".
Which was just recently 65 years ago, was just a grayscale **Mickey Mouse** employee working of strapping the warning stripes around the building, of the abandonment of Treasure Island.
But then was kidnapped by an unknown killer, that just killed the employee inside the building.
While the body was found, the body was found bleeding in the Broadcasting Room, where it had many cuts around the body, having a wrote bleeding sentence on the wall saying: "***WELCOME TO THE TRUE GATES OF HELL.***" wrote in pure blood, of the dead employee's body.
Which the body was just then (by the killer) fitted into the hidden grayscale **Mickey Mouse** costume, that was found behind the TV of the room. Which had a lot of cuts/tears on the costume, and a reddish tint on it.
Where it was eyeless, and the costume was burnt, melted, deform, missing one of the buttons, and a tongue.
The hidden **grayscale Mickey Mouse** suit was then kept off-camera, being thrown behind the TV.
Because of the abandonment from being finished and the closing of Treasure Island, this grayscale **Mickey Mouse** suit became more rotten through the years. Causing his body to go more dirty/melted and deform, and also more darker, and having a lot of changes on the suit, and parts of his body to drop off.
After 65 years of the closing of Treasure Island, Strangely, the body inside the suit has woken up, meaning that the body has came back to life from the dead.
The Ink-blotted eye of the body has gone bad, having a look of an Ink-Blot's eye creature. The suit hasn't met anybody yet, but on one day, Jake Smith, the night guard has arrived to Treasure Island.
Many years have been passing away, the souls within the Suits/Toons become more angry through many days. Their anger takes over the suits/toons, causing the toons to turn into more vicious creatures then they use to be after the SSA began working on Treasure Island.
This grayscale **Mickey Mouse** costume has became more charred, darkened and burnt, within the soul becoming more angry, taking revenge of the people that have taken him away, leaving him to rot. This is why he starts in the Broadcasting Room.

Trivia* Abandoned: Discovery Island's original timeline is the only one in Fate's games, where the suits aren't originally hostile towards everyone around them.