Who are the four kings of Monster Master?

Appearance: half a skull face, pink hair and weird red eyes.

Gender: male

Number of albums appearing: 4, 5, 6, 10 (slightly mentioned at the end of Volume 4 and Volume 10)

Identity: One of the four great kings in Wu Luo, Poloce, a centenarian, but some call themselves 13.

Name: Yunbunolev Kidd.

Appearance: I often wear a black cloak, which is stronger.

Gender: male

Number of albums: 6, 10 (slightly mentioned in Volume 10)

Identity: One of the four kings of Wu Luo, the father of Bubulu.

Name: Albert

Appearance: (this is hard to describe ...)

Gender: male

Number of albums: 10

Identity: Wang Zhiyi, father of Lilith, queen of Zerg, one of the four heavenly kings of Ulopoulose, known as the Red Sage.

Name: Soga

Appearance: Tall and slightly ugly

Gender: male

Number of albums: 12

Identity: One of the four kings of Wu Luo Poirot, the only descendant of the giant.