Valkyrie

The Asgardian Brunnhilde confronted Odin All-Father rather than leave the body of her fallen friend. So impressed was Odin at her courage and strength that he made her the Valkyrie, guide of the honored dead to Valhalla. Armed with Dragonfang, her indestructible sword, and riding her winged steed Aragorn, she is one of the greatest warriors of Asgard, and a champion of Earth.

Earth's Mightiest
Valkyrie was defeated by Beast in the first round.