Gundam Wing: Endless Waltz
Gundam Wing: Endless Waltz is the sequel to Gundam Wing, which is set in an alternate universe to the original Gundam series.
Trieze Krushrenada died, and Oz came to an end. Time passes before Mariemaia Krushrenada, Trieze's daughter, proclaims herself emperor of the United Nation. She then puts a rebellion in place just to take sure that she gets the title. She also kidnaps Relena Peacecraft. As the Gundam pilots investigate further, they find out that Dekim Barton is the pupetteer behind Mariemaia. Dekim is the father of the "real" Trowa Barton that Triton Bloom, better known as the "fake" Trowa Barton, killed. The Gundam pilots have to stop Dekim before he ends up ruling the United Nation.
As with much of Gundam Wing, Endless Waltz is a thinly veiled retelling of the Universal Century - in this case, a retelling of Mobile Suit Gundam ZZ, with Mariemaia taking the place of Mineva Zabi, and Dekim in the role of Haman Karn.