Digimon Sovereigns

The Sovereigns are fictional characters that appear in the anime series, Digimon. There are four Sovereigns: Azulongmon (Qinglongmon), Zhuqiaomon, Baihumon, and Ebonwumon (Xuanwumon).

Each of the Sovereigns is portrayed as ruling over a quarter of the Digital World. This ties into their names, which are all based on Chinese astronomy.