Lilith Clay (Omen)

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Lilith Clay is a fictional character who appears in DC Comics' Teen Titans titles. She is the best friend of Donna Troy (the first Wonder Girl), and the second hero to join the original Teen Titans after its founders, the first being Speedy. Although her origin and powers have varied significantly throughout her history - though in not as nearly a convoluted a manner as Donna Troy's - she is consistently seen as both precognitive and psychic.
Originally living in peace at home, Lilith started to manifest strange mental powers at the age of 13. She read her parents' minds to find she was adopted, then left home to try to find her birth parents. After some trouble, she ended up working as a dancer at the Canary Cottage disco. During this time, she encountered Loren Jupiter, and began to aid him in his cause.
Soon, Lilith approached the Teen Titans and asked to join. She saw premonitions involving a political figure, who inevitably died, proving her power. She then became a member of the Teen Titans.
Eventually, she left the team and resettled on the West Coast, where she started a new branch of the Titans (known as Titans West). She briefly dated one of her team members, Don Hall (Dove), before the team disbanded.
During the Terror of Trigon storyline (New Teen Titans, Vol. 2 #1-6), Lilith played a key role in tracking down the former Titan Raven, who was at that time possessed by her evil demonic father. Eventually, Lilith made some type of psychic connection with Raven's mentor, the goddess Azar, and hosted the souls of her followers in a successful attempt to cleanse Raven of evil.
Lilith stayed on with the Titans briefly, during which time she accompanied the team on a trip to Donna "Wonder Girl" Troy's home island of Themyscira. During this mission into the realms of Greek myth, Lilith finally learned her true parentage: her father was a normal human who had been seduced by Theia, the mythological Greek Titaness of the sun. The power-hungry Thia attempted to take over Olympus, but the young mortal Teen Titans helped defeat the Titans of Myth and returned home safely—all except Lilith, who elected to remain on Olympus, claiming her birthright as a demi-goddess.
The character would disappear again until 1996, with the launch of the Dan Jurgens Teen Titans. At the start of the series, Jurgens had a masked figure named Omen gather the team for Mr Jupiter, who once again was financially backing the Teen Titans. The character was originally intended to be Raven, but an embargo was placed upon the cast of the New Teen Titans appearing in the title, by editorial. As such, Lilith was substituted as the secret identity of Omen.

The New 52:
In the 2011 relaunch of their entire universe, DC introduced a new Omen, who was created as her New 52 counterpart. Omen was a telepath that worked for Harvest and N.O.W.H.E.R.E. and in particular, the bloodsport event known as the Culling; where teen captives of N.O.W.H.E.R.E. were forced to fight to the death.
Omen was blond and had her eyes sewn shut; she could create illusions with her psychic powers and control peoples thoughts. This made her a valuable member of N.O.W.H.E.R.E., as she enforced Harvest's will amongst his henchmen and prisoners.

With the 2016 relaunch DC Rebirth restoring the original version of the character, the villainous New 52 Omen is now a separate character from Lilith.

DC Rebirth:
Lilith Clay goes by the name Omen in the DC Rebirth comics. She is currently in the team called Titans, which is composed of former Teen Titans members who are now grown up with Nightwing, Donna Troy, Arsenal, Tempest, and the pre-New 52 Wally West version of Flash. When the Speed Force restores the Titan's memories of Wally West, it is shown that Wally and Lilith had been in a romantic relationship.