Ruler of Heaven (Omniverse)

The Ruler of Heaven is a title and the highest position any being can hold over Heaven in the series Power Rangers: Omniverse

History
Since the creation of Heaven and its angels, God ruled Heaven from Heaven's throne room. After Lucifer bypassed Gadreel's defenses and corrupted mankind, God ordered Lucifer's imprisonment and then abandoned the position.

Michael, being the most powerful archangel, became the viceroy over all of Heaven, but did not reveal God's absence to the majority of his brethren. He ordered the angels to stay away from humans for thousands of years, after which he and his senior angels worked to get the Apocalypse to take place.

In Chpt5 of the series, Michael's defeat and fall into the Cage caused Heaven to lose stability. Raphael, the only archangel available at the time, sought to become the new leader with his first goal being the restarting of the Apocalypse in Chpt6. Castiel defied Raphael and a civil war broke out. Through the power of millions of monster souls and the Leviathans, Castiel was able to obliterate Raphael and any who opposed him. His death at the hands of the Leviathans left Heaven without a proper ruler but a twisted and power-hungry Castiel in the start of Chpt7.

Between Chpt8-9, many factions were formed, each seeking to take control over Heaven according to their own will. Among them was Naomi. Metatron was able to kill Naomi and banish all the angels from Heaven, declaring himself the new ruler in Chpt9. Though the combined efforts of the Rangers: Hunter & Kurt, and the angels: Castiel & Gadreel, resulted in Metatron's defeat and imprisonment. Heaven now current has no ruler as the angels now decides to answer to themselves.