Some TMNT stuff really isn't for little kids.
In the Teenage Mutant Ninja Turtles & Other Strangeness role playing game by Palladium Books, Igor is the keeper of captive animals in the secret underground laboratories beneath the mansion belonging to Dr. Victor Oban Feral. Igor is a core BIO-Spawn character, and also has a role in a scenario published in Teenage Mutant Ninja Turtles Guide to the Universe.
Igor is a mutant white rat. But unlike Feral's chief lab assistant Karl, Igor's mutation is only partial. As a result, Igor does not as often stand up vertically on his legs, has more animal-like hands, and has an even more animal-like quality of speech.
Igor's clothing appears even more simple and improvised than Karl's outfit, consisting of only his (secretly-deactivated) control collar, a belt, a breechcloth attached to his belt, and a pair of suspenders to hold his belt in place. He also wears a spiked bracelet on one of his wrists, though which wrist it's on is not consistently shown.
Igor is a quiet individual, but very scheming and vindictive. He conceals a variety of secrets from Feral: his high intelligence, his psychic powers, and the fact that he has covertly deactivated the control collar that Feral has surgically implanted around his neck. Igor keeps these secret because he knows that if Feral suspected just how powerful Igor's mind is, Igor would probably be promptly vivisected as just another subject of research. Despite this, and unlike Karl, Igor doesn't hate his place in the lab—he enjoys brutalizing the animals in his custody, and wouldn't leave unless he absolutely had to.
Igor has a high capacity for intelligence, far more so than Karl, though not actually as educated as him. Still, Igor was smart enough to figure how to secretly deactivate his control collar. Igor is also exceptionally strong, and is an expert at hand-to-hand combat. Igor has enough skills to assist Feral's operations in more practical ways, including as a mechanic, a computer technician and driving a van.
Igor was born an ordinary white rat, but became one of Feral's earliest mutant creations (after Otto Rattus). As animal keeper in Feral's secret underground lab, Igor's work is menial, but he was smart enough to figure out how to secretly deactivate his own control collar.
In the Teenage Mutant Ninja Turtles Guide to the Universe scenario "The Mutant Mastering Mind Machine", Feral built and began use of his Mentawave Device, a machine that grants powerful psionic abilities to its wearer. Feral's first test of the device was to force Igor's body to move around at will. The device's power alarmed Igor, who knew that Feral would vivisect him if he discovered Igor's own psychic powers (especially considering Igor had been using his hypnotic suggestion on Feral for years) or that he had deactivated his control collar. So Igor fled BIO-Spawn, unaware that Feral had not actually quite figured out why Igor had run off, or that his mostly deactivated collar still had a functioning tracking device. In this scenario, player characters have the opportunity to locate Igor inside a factory complex, and temporarily ally themselves against Feral's Mentawave Device. But Igor is treacherous, and will use his hypnotic suggestion whenever it serves his interests. The end goal of the scenario is for Igor to find a way to hypnotically convince Feral that he cannot properly use the device, and that only Igor should be allowed to use it. This involves infiltrating Feral's mansion and lab while Feral is wearing the device, and fighting security guards, mind-controlled animals, and Otto.
- Feral, Karl and Igor were originally illustrated by Kevin Eastman and Peter Laird for TMNT&OS, but appear only in Palladium Books canon and as Dark Horse Miniatures, and have no presence in the Mirage continuity itself.
- Igor's name and role are an allusion to the stock character of the same name featured in various science fiction and horror stories.