Satana is the sister of Daimon Hellstrom aka the Son of Satan in Marvel Comics. Created by Roy Thomas & John Romita, she made her first appearance in Vampire Tales #2 (October 1973).
Satana is a half-demon/half-human hybrid, and a succubus; she has several innate mystical abilities. She can feed on the souls of men to empower herself, allowing her to fly, fire blasts of eldritch force or hellfire, and hypnotize her victims. If she touches any object which has been used to kill someone (like a knife or sword) she can absorb its "blood energy" to become stronger. Satana was also trained in the mystic arts and learned how to cast spells and perform witchcraft.
From 1975 through 1976 the character made several marquee appearances, apparently in an effort to establish her as a headliner, none of which really led anywhere, but Satana has still popped up from time to time in the Marvel Universe.
[Illustration, above, is by Esteban Maroto.]