Mobile Suit Zeta Gundam, Mobile Suit Gundam 00 Second Season Recommendations
The Second Season of Gundam 00 is much is comparable to Zeta Gundam
Setting: In 00, the world has been united like Celestial Being wanted, in Zeta, Zeon has been defeated but both victories result in two SS-like organisations oppressing people; the Titans in 00 and A-laws in 00. Celestial Being now becomes a AEUG-like organisation and like how the AEUG allies it self with Earth-based Karaba, it allies itself with Katharon.
Characters: Lockon Stratos is very much like Quattro Bajeena, all mentors to their series' protagonist. Heartless monster in it for pleasure/money; Ali Al-Saachez is based upon Yazan Gable and Graham is a mix of Scirocco
They are both about a paramilitary organization who has gained too much power and transformed the Earth into a de facto dictatorship and both focus on a clandestine organization attempting to stop them. They are both intentionally similar in style and themes in regards to authoritarianism.