Chokyūkai

was a demon originally from the continent (China), before immigrating to Nihon (Japan). A descendant of Cho Hakkai (Zhu Wuneng (lit. "Pig Awakened to (Will)Power")/Zhu Bajie (lit. "Pig of the Eight Precepts"))), Chokyūkai, taking much after his ancestor (lazy, cowardly, gluttonous and lustful), decides that, like his ancestor, he is 'inspired' to take only young and beautiful Ningen (Human) brides.

Having already enslaved a descendant of Son Goku (Sun Wukong; 孫悟空, lit. "Monkey Awakened to Vacuity")) and Sha Gojyo (Sa Gojō/Sha Wujing, lit. "Sand Awakened to Purity"), with tiara-like golden bands, Chokyūkai ambition was to amass a harem for himself to tender to his every whim, using the same kind of tiara-like golden bands he'd used to enslave Son Goku JR and Sha Gojyo JR. (like the one used on Son Goku SR. to control him with the "Headach Sutra" (similar to Inuyasha's Beads of Subjugation)) to control them (and the same ones used on them).

At some point, Chokyūkai and Son Goku's descendant and Sha Gojyo's descendant were captured and sealed away, until events resulted in their release, at which point Chokyūkai immediately began to assemble for himself anew. Having already abducted a number of young women from a local village, the village appeals to InuYasha and Co. to vanquish the Yōkai abducting their daughters before the rest (who were now in hiding) were taken, too.

InuYasha was originally reluctant to help, but after Chokyūkai turns his attentions to Kagome Higurashi for his newest bride (after learnig that she was familiar with his ancestor), however, InuYasha became deadset on vanquishing the Chinese Boar Yōkai. Luckly, Miroku has a Chinese Exorcism Sutra in his possession, having noticed that their regular methods weren't as effective. After Shippō lures Chokyūkai out of his manor, InuYasha has a chance free Kagome from the tiara-like golden band and pass her back her bow and arrows and the Chinese Exorcism Sutra to use to vanquish/banish Chokyūkai.

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.

Manga VS Anime
Chokyūkai was 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.

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 "". Apparently, only changes his name from "eight" to "nine" comparing to his ancestor's.
 * He's also similar to the Dragonball character Oolong. Oolong also took young girls to be his brides and Oolong was also based on Zhu Bajie (Zhu Wuneng) as well.