Princess Diana/"Diana Prince", A.K.A. WONDER WOMAN!
Within the Batman Beyond time era the 2nd iconic world wide known leader of the JLU (as well as 1 of the main 7 original founders of the Justice League itself) Wonder Woman is still on "Mans world" and is still is the ambassador of her fellow Amazonian sisters who are still being ruled by their loving queen and mother to Diana Hypolytta.
Despite her loving and mentoring nature Wonder Woman has became battle hardened by this certain time era and has no qualms about letting the world know which is seen by the very Amazonian warrior garb she wears in place of what was once a mere star spangled American themed bathing suit number.
Batman Beyond and Wonder Woman are property of DC Comics.