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Keukegen is yōkai made of long, black hair, that is usually described as dirty and messy. His eyes have red sclerae, thin gray irises, black pupils and thin pink outer canthi. Between them is a small, black nose with prominent nostrils. Underneath his nose the locks of hair form a distinct mustache separate from the rest of his hair.
In the manga, Keukegen's is made of long, messy dark hair with distinct locks that form his limbs. Between his eyes is a light-colored bulbous nose and locks that form a mustache.
Within the first anime, Keukegen is made of long dark hair, having locks forming a mustache, arms and legs. His eyes have light sclerae and small dark pupils, between is a light-colored, bulbous nose.
In the third anime, Keukegen's body comprises of long white hair, with locks forming a mustache, arms and legs. His eyes have yellow sclerae, black pupils and red outer canthi. Between his eyes is a bulbous white nose, matching his hair.
Within the fourth anime, Keukegen has black hair comprising his body, with several locks forming a mustache arms and legs. His eye have purple rings around them, green sclerae, thin yellow irises and black pupils. His bulbous nose is tan in color and sits just below his eyes.
In the fifth anime, Keukegen's body is composed of long white hair, having locks that form a mustache, arms and legs. His eyes have white sclerae, green irises and black pupils, between them is a small red nose.
Keukegen appears in episode #28 of the fifth anime adaptation, Dinosaur Kitaro Appears!
Keukegen appear as a mass of long, dirty hair, making their homes in cool, damp and dark places, particularly around abandoned homes and under floorboards. They are shy creatures and try to avoid human contact. Being minor spirits of disease, bad luck and pestilence, they bring sickness to whoever lives near them. However they are easy to avoid, as they keep away from clean houses. Their name is a pun, where it is written with characters meaning "A hairy, fluffy sight" but can also be written with characters meaning "rare and dubious".