Lilith

In Canon

The Second Angel, a Seed of Life, progenitor of humans.

Her primary body was crucified in the Geofront, and clones of her DNA mixed with Yui Ikari's DNA were used to form the bodies of Rei Ayanami.

Differences from Canon

Lilith takes an active role during the events of Shinji & Warhammer. She constantly mentally assaults Rei

Devouring her children.

An unquechable thirst for souls

Tried to have sex with Shinji

Maybe a woman, maybe a man

Lilith is She-Who-Thirsts/Slaanesh