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!
In a world of science, sorcery is rediscovered and rapidly adopted in all areas of industry – but at a high price: an invisible pollution is spreading out across the world. Those who do not take proper precautions become infected, lose their sanity, and become demons. The Sorcery Administration Bureau, along with their Tactical Sorcerers, monitor magic uses and respond to any demonic outbreaks that occur. In this world, Ray Otto is a rogue tactical sorcerer who hunts down demons with reckless abandon. Given that he always gets the job done, the administration generally lets his activities slide. Together with the mysterious girl Kapel Theta, Ray risks his life and humanity to destroy demonkind... when the price is right.
Strait Jacket and Code Geass: Lelouch of the Rebellion take place in worlds that are filled with monsters, one literally and one figuratively so, and follow the paths of two men who fight to destroy them at any cost. The methods they use are different, and the enemies certainly don't look the same, but the inherent darkness in these shows and the truth about how one becomes a monster really bind these shows together.
In the near future, Mars is covered with oceans. Within one of its cities, Gram River is just another kid trying to survive in the slums, until he finds himself right in the middle of a pirate attack! After nearly drowning, he finds himself aboard the pirates' ship, and is faced with a decision: be killed, or stay and fight alongside them. And thus, Gram joins the pirate crew in their quest to find the legendary treasure of Mars, but they aren't alone in their search. Now, while being hunted by the military, bounty hunters, rivals and even a few old friends, they search the seas of Mars for clues...
The intensities (and mindf*ck levels) of The Mars Daybreak and Code Geass: Lelouch of the Rebellion differ greatly, but they do actually contain similar themes. A corrupt government that doesn't care about the poor, a group struggling to change things, a relationship torn apart by war... If you watched Mars Daybreak, you really should do yourself a favor and move up to Code Geass. If you finished Code Geass but wanted something a bit more straight-forward, try Mars Daybreak.
Nightmares creep into the waking hours as Mina Tepes, childlike Queen of the damned, shockingly appears on live television to announce her plans for a colony where her blood-sucking brethren can live in peace. As pandemonium engulfs the globe, Mina reconnects with a handsome face from her past: Akira, a brooding beast whose link to the queen is both powerful and mysterious. Together, Mina and Akira will bare their fangs and fight against an ancient evil. And though the Queen and her ferocious werewolf minions vow that no human blood will be spilled, there are others of her kind who yearn to sink their teeth into innocent flesh. Can Akira maintain his fleeting link to the realm of the living while battling to protect this ruthless and royal beauty? Only one thing is certain. The world’s not ready for her reign.
Having recovered from the injuries he had sustained, Zero returns to Cross Academy to resume his role as prefect. Though, not long after he resumes his role, members of the Supreme Vampire Council ambush Zero with the intent to execute him for the murder of the pureblood, Shizuka. Luckily when Kaname intervenes, he sends the council away and insists that they stay out of school affairs. However, whilst Kaname continues to hide the truth about Shizuka's death, there are others who grow suspicious of what happened that night and what the dorm president is hiding. Meanwhile, Yuuki begins to have flashbacks, leading her to investigate her blood-stained past: what will she find, and will she continue to be tempted by an offer from Kaname?
Vampire Knight and Code Geass share very similar characters. The male leads, Kaname in particular, are structured like Lelouch--clever, conniving, and tortured. However, the protagonist in Vampire Knight is female which shakes the dynamic up a bit. Both animes center around the plots and schemes of its main characters, and...the inevitable chess board.
Princess Rinda and her brother Remus are the foretold Twin Pearls of Parros – one will be a shining prophet and the other a great ruler. However, when their homeland is lost to the invading Mongaul army and their parents slain during the siege, Rinda and Remus are transported into Rood Forest, a dangerous hideout for ghouls. Lost and vulnerable, the two barely escape death thanks to the help of a powerful man with the head of a leopard called Guin who cannot remember who is or how he became that way. Together they journey across the land, evading monsters, fighting the power-hungry Mongaul army, and gathering trusted companions such as Istavan Spellsword and Suni of the monkey-like Sem – all in the hope of fulfilling their destinies and finally bringing peace to Parros.