She is the half-Vietnamese/half-German daughter of Gustav Brandt (Libra), who abandoned her at the Temple of the Priests of Pama. The alien Kree believed her to be the Celestial Madonna and a possible mother for the Celestial Messiah. As an ally of the Avengers, she battled many enemies, including Zodiac, Thanos and Ultron, among others. When she eventually joined the Avengers, it was revealed that she was, in fact, the Celestial Madonna. She then left the Avengers, married a Cotati (another alien race) and left Earth to mate.
After her DC/Eclipse/Image hiatus, Mantis made appearances in Avengers Forever and Avengers: Celestial Quest where she aided in a battle against Thanos as a West Coast Avenger before the short miniseries Annihilation: Conquest: Star-Lord.
Though she was born a powerless human, over the course of her life she developed a telepathic ability, as well as the ability to communicate with plant life. She is also precognizant and has superhuman strength. In addition to her superpowers, she is also proficient in the martial arts and meditation.
Fun Fact: Mantis was ranked #99 in Comic Buyer’s Guide’s “100 Sexiest Women in Comics.”