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Ghouls (喰種グール, gūru, translates approximately to eater species) are a carnivorous and cannibalistic humanoid species that are only able to feed on the flesh of humans and other ghouls. They normally share and display the same attributes as Humans; being similar in physical appearance and intelligence as a human, with the main exceptions being their inner biology, mentality, and diet.
If certain rare conditions are met, ghouls and humans may even be able to have offspring (see one-eyed ghoul and half-human), and through a successful kakuhou transplant surgery, an artificial hybrid can be created. By using airborne-transmitted diseases like those utilized by Furuta Washuu, the condition known as ROS (an overload of RC cells) can lead to artificial ghoulification.

Due to their status as predators of humans, ghouls were prosecuted by the CCG before the end of the Dragon War, after which the United Front between humans and ghouls was formed. As a result of this and the development of synthetic food, ghouls were allowed to co-exist with humans. However, some ghouls went rogue, refusing to adapt to this new lifestyle.

In addition, it was predicted by Kishou Arima that at some stage every human would eventually become a ghoul, though this prediction has yet to be proven correct even after the final chapter.
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