Doctor Fate

Doctor Fate, more accurately referred to as Nabu, is a Lord of Order, a supernatural entity and a superhero. As a Lord of Order, he relies on human hosts to have a presence on the Earthly plane. He can take over host bodies when they wear the Helmet of Fate, transforming them into Doctor Fate. While he is in control, the souls of his hosts remain within the Helmet, powerless to influence the outside world.

For many years his host was Kent Nelson. During this time, he was once a member of the Justice Society.

History
When Inza Nelson convinced Kent Nelson to stop wearing the Helmet of Fate, Nabu remained trapped in the Helmet for 65 years. When Wally West finally put on the Helmet in order to fight Klarion the Witch Boy, the new Doctor Fate managed to defeat Klarion by threatening his familiar Teekl.

After this, Nabu refused to relinquish control of Wally's body. Kent Nelson (who had been mortally wounded, and sucked into the Helmet along with Wally when the young hero put it on) convinced Nabu that Wally was not the right suitor to be the next Doctor Fate. He promises that Nabu will not be cooped up in the Helmet for yet more decades, since Wally will find a replacement, and until that time Kent offers to keep Nabu company within the Helmet. Nabu accepts the offer, and releases Wally.

Once released, Wally quickly rationalised his experiences, explaining away his vision as the Helmet temporarily re-writing his brain beta waves. Furthermore, he has not yet found a replacement Doctor Fate, deciding to keep hold of the Helmet as a souvenir from the mission.

Known hosts

 * Kent Nelson
 * Kid Flash (briefly)
 * Aqualad (briefly)

Powers and abilities
Nabu's magical connection to the Helmet of Fate allows him to completely possess the body of the wearer. Once in control, he can utilize many mystical abilities including:
 * Flight
 * Energy BlastsKid Doctor Fate.jpg
 * Magical Constructs
 * Telepathy with his human host