If you're looking for anime similar to Code Geass: Lelouch of the Rebellion, you might like these titles. All recommendations are made by Anime-Planet users like you!
Hakaze, princess of the Kusaribe mage clan, has been betrayed and marooned on an island by her own people. They seek to revive the Tree of Exodus, an incomprehensibly powerful entity of alien origin, to save the world from the tyranny of its antithesis: the Tree of Genesis that powers their magic. Hakaze, however, believes their efforts put humanity in jeopardy; and with her power limited, she can only reach out to the world to beg for aid. Her call reaches Mahiro Fuwa, a young man grieving the mysterious death of his sister, Aika. He and his friend Yoshino agree to help - on the condition that Hakaze track down Aika's killer with her magic. The deal is made, and the battle that will determine civilization's fate is begun: but who will play the part of its villain, and who its savior?
They're both great animes with dark themes where the protagonists fight to right an injustice and an almost brother/rival relationship between the two male characters. They have complex characters where motivations are not always clear cut and events can turn the story on its head.
The characters are also similarly somewhat haughty and arrogant (CG - Lelouch, ZnT - Shakespear quoting lolita complex guy) anti heroes. I liked Geass a bit better due to its length but Tempest has a much more satisfying ending imo. Enjoyable animes both.
Fifteen-year-old Ichigo Kurosaki is a typical teen with fighting skills, two caring sisters and a special trait: he can see ghosts. However, when Ichigo and his family find themselves under attack by a huge beast, Ichigo discovers that there’s more to the supernatural world than the everyday specter. Vengeful spirits known as Hollows roam the world in search of devouring souls, and Shinigami – soul reapers – work tirelessly to defeat them and guide normal ghosts into a place called Soul Society. Ichigo valiantly fights the Hollow that threatens his sisters, but on the verge of defeat a Shinigami named Rukia gives him her powers, turning him into a Shinigami himself. Ichigo must now adjust to his new life of both vanquishing and saving souls for the sake of Soul Society.
With so many similarities in setting and plot devices (In both anime, the MC received a supernatural power, and many more), these two represent each other quite well. Both are mecha anime that play on a really big scale, featuring a huge cast of characters stuck inside a war between two nations. Packed with action, politics and supernatural, it’s pretty clear that those two draw the same kind of audience. If you liked one of these two, then there’s a good chance you might like the other one.
Show may be different due to it's differences but the main Characters Lelouch and Suzaku's ideals and friendship are similar to Yuri and Flynn where Lelouch and Yuri wants to change from the outside and Suzaku and Flynn wants to change within. Both are awesome where it involves battles, politics, corruption, drama, blood, loss of allies, and friendship.
After defeating the evil Chaos, Syaoran and the gang have arrived in what appears to be an apocalyptic and run-down Tokyo – a city in which acid rain has destroyed the buildings and taken numerous lives. The atmosphere is ripe with tension, as the city’s remaining survivors have formed clans in hopes of protecting the underground wells from other clans and strangers alike – strangers like Syaoran and friends. With Sakura’s remaining feathers being located in the wells and opposition at every turn, the feathers’ retrieval seems dire, and Syaoran will finally face his most dangerous enemy...
Code Geass and Tsubasa: Tokyo Revelations are similar in someway whereas the main setting Japan which Tokyo is part of is in a desperate state (Japan is colonized in Code Geass and Tokyo is in ruins in Tsubasa: Tokyo Revelations) as groups such as the Black Knights and Kamui's and Fuma's respective parties search for a way to restore their homes back to normal. Lelouch's character design is similar to Kamui and Suzaku's to Syaoran due to Clamp doing both the character designs. Twists and betrayal occurs as well as revelations that will change the story forever. Both shows have dark tone and action packed fights as well though they are different in terms of style (Code Geass-Mecha and Tsubasa-Magic). Try watching one of these if you've watched one of them which will be a great addition to your collection!