Umar is a fictional character who resides in the "Dark Dimension" of the Marvel Comics multiverse. She is a Faltine, but is trapped in human form. Although she is a sorceress and has vast magical powers, she is still second to her brother Dormammu. Umar is commonly a foe of Doctor Strange as well as the mother of his wife, Clea.
This battle weakened Umar, and she became subordinate to her brother. Dormammu ascended the throne as regent and ruler of the Dark Dimension. He reassumed his Faltinian form of flame, but Umar chose to remain in her human form.
Her inability to transform angered Umar, and in her frustration she lashed out at Dormammu. Now far stronger than Umar, Dormammu banished her to one of the subjugated pocket dimensions of the Dark Dimension.
In time, Dormammu tried to invade Earth's dimension and came into conflict with first the Ancient One, and then Dr Strange. Eventually Dormammu was defeated, and the spell banishing Umar was broken. Despite having been banished by him, Umar sought to avenge her brother on Strange. She held Clea hostage in the Dark Dimension, to lure Strange back in. When she first fought Strange, she was the more powerful, but then the entity called Sayge showed Umar an image of Umar's original Faltinian visage. This sight drove Umar almost to madness, and she travelled to Earth to destroy it in revenge. Strange defeated her by summoning another monster; Zom.
After this, Umar performed as Dormammu's subordinate again. She assisted him in his schemes, and helped resurrect him when he fell in battle. While Dormammu was gone, Umar ruled the Dark Dimension until she was overthrown by Clea, who discovered the truth of her parentage during the struggle.
Dormammu returned to overthrow Clea. Clea and Doctor Strange escaped Dormammu, but met with Umar, who wanted to kill Doctor Strange. Umar noticed that her spell was also affecting Clea. Clea revealed that they had been married and that there now was a mystical link between them. Umar stopped her attack and admitted to Clea that she was unable to kill her own daughter. She assisted Strange and Clea in overthrowing Dormammu. Umar tricked her brother by suggesting that they divided the rulership over the Dark Dimension into two parts. Dormammu agreed and Umar banished him to his part: the domain of the Mindless Ones. Umar made peace with Strange and Clea and would now rule the Dark Dimension with Baron Mordo at her side. Clea returned to Earth with Strange.
Many months later, Clea was approached by another Faltine, who claimed to be her cousin. He informed her that she needed to defeat Umar, who had turn into a dictator. Clea returned, but found out that it was a trick: the other Faltine was Dormammu in disguise and he absorbed Umar and Mordo into his own body, growing gigantic in size and power. Clea remained in the Dark Dimension to battle Dormammu.
Somehow Mordo and Umar were separated from Dormammu again, and Umar would assist her brother, though she still had her own agenda. Their most recent exploits are featured in the 2005 Defenders miniseries.