Saiyuki [TV]

Many years ago, humans and demons lived in harmony. But that unity ended when demons began 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.

Similar in these categories.

Bleach

Fullmetal Alchemist

One Piece

Naruto

Blue Exorcist

The Melancholy of Haruhi Suzumiya

Soul Eater

God Eater