Kazuya Minekura

Kubota Makoto and Tokitoh Minoru (characters from Kazuya Minekura's manga Wild Adaptor -- though no reference is made to the darker storyline of WA in this light-hearted anime) are the muscle of their high school's all-powerful student council. They defend the student body from disorder -- generated by both humans and demons -- while avoiding their classes. (imdb)

Many years ago, humans and demons lived in harmony. But that unity ended when demons started attacking humans and plotted a mission to unleash Gyumao--an evil demon imprisoned for thousands of years. Now, Genjo Sanzo, a rogue priest, must team up with three demons--Sha Gojyo, Son Goku, and Cho Hakkai--and embark on a perilous journey to the west to stop these demons from resurrecting Gyumao and restore the balance between humans and demons on Earth. (myanimelist.net)

The gang is traveling along when they find a girl in need. Of course, they all can't resist going after her. This girl isn't all that she seems... her motive or her "humanity".... and soon the whole gang has Sanzo's past on their hands and one certain young boy who can keep a grudge for decades... (myanimelist.net)

Priest Genjo Sanzo and companions Cho Hakkai, Sha Gojyo, and Son Goku maintain their westward journey to stop the resurrection of the demon Gyoumao. As the reputation of the Sanzo Ikkou precedes them, they continue to fight demon assassins at every turn, but they must also deal with increasing tensions within their group in order to defeat a powerful enemy. (imdb)

The Sanzo Ikkou continues its westward journey, on a mission to prevent a demonic resurrection. As Genjo Sanzo, Cho Hakkai, Sha Gojyo, and Son Goku fight their way to their goal, their path is fraught with internal strife. When they encounter a formidable pair of adversaries from the west, the cohesion of the group -- and the fate of the mission -- may be at stake. (myanimelist)

At last, the Sanzou Party has arrived in India. In this foreign land, where the anomaly's influence runs rampant, their battles only heighten in their violence. And also awaiting them is their tragic fate from 500 years ago-- What will they find at the end of their long and treacherous journey? (myanimelist)

When their latest assailants turn out to be humans, the group is left dumbfounded. The mystery only deepens when they encounter a wandering priest, Hazel Grouse, and his imposing bodyguard.

A mysterious light falls from the Heavens. It's the Pearl Jade. It can grant any wish. Dr. Ni tells Gyokumen Koushu about it. Then Sanzo and company to go and find and seal it before it falls into the wrong hands.

Taking place in the past it offers a view at the Saiyuuki quartet before their formation and their journey to the west. First OVA starts with Sanzo and his master, also with Ukoku (known as a later Ni Jianyi). Second OVA shows first meeting of Goku and Sanzo. Third OVA considers the events after Hakkai's sins and his trial (that we know from first season of "Saiyuuki") and his decision to live in Gojyo's house.