Source: comicbook.com

9. Dormammu

Look, when your head is made of actual fire, it may be safe to assume you're a little bit OP.

Dormammu ruled over the Dark Dimension for millennia, using the Mindless Ones as minions for his activities. He kept mostly to himself until the year 1666, when Earth caught his attention. He attempted to steal the souls of London through fires and a dimensional gate at Stonehenge, but the resident Sorcerer Supreme banished him back to the Dark Dimension. He did battle with the Ancient One numerous times, as well, making a mortal enemy of him. One such battle involved the Red Skull, Captain America, and Nick Fury, so that was pretty interesting.

Dormammu corrupted one of the Ancient One's disciples, Baron Mordo, and turned him evil, only to be stopped by Stephen Strange. Strange and Dormammu would quickly become deep seated foes, with Dormammu even teaming up with Loki to destroy Strange during the Avengers/Defenders War. Dormammu was dissipated or banished or other such things many times, but always returned to menace Strange, most recently among a gauntlet of his other notable foes.

Power Level: Real hothead.

                                                          Source: inverse.com

8. Darkseid

Darkseid Is!!!

Born as Uxas, Darkseid soon became the ruler of Apokolips, a fire spewing deathtrap of a planet with an army of Parademons at its disposal. Darkseid cultivated a cadre of minions, all of whom became devoted to his cause of annihilating New Genesis and killing Highfather's New Gods.

Eventually, the warring sides came to a peace agreement. Highfather and Darkseid traded sons. Darkseid's son was raised with love, and became a true hero known as Orion. Highfather's son was imprisoned and tortured, but trained himself to become Mr. Miracle, the greatest escape artist of all time.

Darkseid sought the Anti-Life Equation, a dark and powerful equation that he could use to gain ultimate power. In pursuit of it, he ran afoul of Superman, and eventually the Justice League. He fought the DC heroes for years, until he died, came back, and was killed by Batman and the Black Racer.

Power Level: Darkseid Is.