Chokyūkai

was a demon from the continent (China) who used human girls as brides, including Kagome Higurashi. He gets girls to be his bride by placing a golden diadem on their head. His servants are Son Goku and Sha Gojyo.

Manga VS Anime
Chokyūkai is an anime-exclusive character, so his encounter in Season 6 with Hakudōshi and Entei did not transpire in the manga. However, in the manga, Hakudōshi acquires his naginata after Entei tramples a boar demon identical to Chokyūkai (after that this boar killed a human).

Chokyūkai's naginata is also identical to the one that Hakudōshi took from the boar demon. In the anime, Hakudōshi obtains it after killing Rengokuki and it is colored slightly different.

So the physical appearance of Chokyūkai is based on that of this demon boar.

Physical description
Chokyūkai has the appearance of an anthropomorphic boar. He has brown fur, two red marks on his face and two small horns beside his nose. He wears a necklace which appears to be made out of small human skull shapes.

Trivia

 * He is very similar to Miroku in his pursuit of women, asking them to bear his child
 * The name 'Chokyūkai' is almost same as his grandfather's name called 'Cho Hakkai' ('豬八戒' in Chinese), who originates from a Chinese classic story named 'Journey to the West'. Apparently, only changes his name from "eight" to "nine" according to his grandfather's.