One-Eyed Ghoul

A one-eyed ghoul (隻眼の喰種, sekigan no gūru), also called half-ghoul (半喰種, han-gūru), is a human-ghoul hybrid who possesses a ghoul's abilities. Most ghouls treat their existence as an urban legend or have never heard of their existence at all.

Characteristics
One-eyed ghouls earn their name from the single kakugan they possess, in contrast to normal ghouls. Some individuals are noted to have a unique scent that combines traits of a human and a ghoul, identifying them as different and often considered "enticing" by certain ghouls. In Tokyo Ghoul, Ken Kaneki has been shown to smell like a ghoul by some individuals whereas some cannot tell the difference, and Eto Yoshimura has been shown to smell like a human so far. It is unknown whether all hybrids have this trait. Their flesh and blood is also noted to be particularly delicious, making them a potential target for cannibalism.

Rumors state that hybrids are more powerful than ordinary ghouls due to hybrid vigor, though it has not been further elaborated on. Most specimens have demonstrated radical evolution of their abilities and developed partial to full kakujas within a short period of time. Physically, their bodies are identical to that of a ghoul with the same resistance to harm and ability to use a kagune.

Artificial one-eyed ghouls can only consume flesh of human or ghoul origin like normal ghouls and thus they are strictly a cannibalistic organism.

Origins
Hybrids come into existence through two methods, either normally born as a result of the union between a ghoul and a human, or through transplanting a kakuhou into a human host.

Natural

 * Ichika Kaneki
 * Eto Yoshimura

Artificial

 * Shouta Magatsuchi
 * Ken Kaneki
 * Kurona Yasuhisa
 * Elma
 * Amon Koutarou