Judge, doom

Doom is the much-feared Judge of Toontown. Despite presiding over a city of Toons, he is totally without mirth and passes capital punishment on Toons who break the law, placing them in a chemical vat of turpentine, acetone and benzene (essentially oil, paint thinner and film dissolver) which he calls "The Dip".

This concoction melts Toons, permanently killing them. He wears gloves supposedly to avoid the mess (but as it is soon revealed, it is actually to prevent himself from melting). He employs Toon weasel henchmen (the Toon Patrol) to assist him in hunting down Roger Rabbit for the murder of Marvin Acme, whom he framed for the act that he did himself.

A few years earlier, Doom had robbed the First National Bank of Toontown and killed Teddy Valiant, one of the two detectives that were investigating the theft. He then used the cash (Simoleons) to buy the judicial election and win against his unseen opponent, but then he "disappeared" into the city.

Personality Doom's most defining character trait is his intense hatred towards Toons, which is far more intense than those of anyone else in the film, even more so than Eddie Valiant himself.

Doom is also a two-faced character as well, having displayed two very different personalities in the film, both of which were equally menacing to his enemies.

Human Doom is a calm and reserved man without mercy and brutally executes those who he perceives as guilty or stand in his way. He is also cruel to the Toon Patrol and mainly abuses them with his cane, though he only hits two members. First, he hits Smart Ass around the head with his cane after he continued laughing, and then he hits Greasy around the head after his hand was caught in a bear trap. He has the ambition to erase Toontown in order to create a freeway due to its profit and potential benefits; buying and then dismantling the "Red Car Trolly" to avoid competition and taking money from his theft at the bank to launch the project.

He is also the CEO and sole stockholder of Cloverleaf Industries.

He also proves to exhibit a cunning personality, as he lures Roger out of hiding with the "shave and a haircut" trick. As an extension of his cunningness, he also was shown to have a more pragmatic side to his personality, as demonstrated by his berating Smart Ass for his laughing due to realizing that would kill the latter, and to a lesser extent his making no attempt at killing Eddie during Lena Hyena's mad chase towards him (the implied reason being that Eddie being stuck with Lena would ensure he got Toonville uncontested). He has a Hitler complex which he tries to deny to the extent of disguising himself as a human to try to rid the world of Toons, despite being one himself. However, when he is being run over, he acts like a Toon (screaming incomprehensible noises in fear) and does not deny it once the jig is up, but when called a Toon, he replies "not just any Toon..."

Toon After Doom re-inflates himself with a helium tank, he reveals himself as the killer of Eddie's brother, Teddy, telling him why he should not remember his eyes, but his voice (which grows higher until it reaches a horrifyingly high pitch) and his eyes turn to daggers to show Doom's intent to kill Eddie. Though he doesn't talk again until his demise, he pursues Eddie when he tries to run away and reactivates the cannon to melt Roger and Jessica once he was pushed to the ground. He then punches Eddie with an anvil, turns it into a buzz saw, and slices through some hanging chains to demonstrate how lethal it was. Doom slowly strides towards Eddie with swirling eyes and a wide, maniacal, psychotic grin.

All these traits show that he was a deranged and sadistic psychopath who enjoys making his victims watch as their friends die and loves to kill them slowly in the most agonizing way, and in the case of his revealing his true identity, also relishes in psychologically tormenting his targets regarding bad memories. In his flesh-and-blood guise, Doom uses his skull-headed swordstick and Acme products to fight Eddie and overpower him with surprising strength. He also was shown to be surprisingly durable in this form, as he was shown to run away despite being shot by Jessica Rabbit. It is heavily implied his strength and durability were holdovers of his true Toon nature. While in his Toon form, he has evil red eyes and a squeaky voice and is able to produce an arsenal of tools from his body which he can employ as weapons, including an anvil and buzz saw. He uses springs in his feet to jump far distances, and (like most Toons) can survive almost anything but his own Dip, which melts him to his death.