Little is known about Walküre, one of the fallen heroes of earth-7 victim of the atttack of the Gentry.
She was risen from the dead when the Gentry attacked earth 8, with its army of fallen heroes. With the defeat of the forces of the Gentry, Walküre returned to her resting place.
With earth-7 an analog to the Marvel Ultimate Comics line, Walküre is probably an analog to Valkyrie, Thor’s distaff counterpart in the Marvel Universe. However, Walküre also resembles Angela, recently integrated to the Marvel main continuity.
Her clothes resembles the Wonder Woman archetype. If there is a Walküre analog in earth-8, is unknown.