If you're looking for manga similar to Code Geass: Lelouch of the Rebellion, you might like these titles. All recommendations are made by Anime-Planet users like you!
The first law of alchemy is that "one cannot gain something without giving something of equal value in return" - a rule that two souls dare to cross. When Edward and Alphonse Elric try to revive their dead mother, breaking the taboo of human transmutation in process, Ed loses his right arm and left leg while Al loses his entire body. After the tragedy, an alchemist named Roy Mustang visits them and tells Edward to become a state alchemist to find a way to recover what they have lost. Accompanied by Al, whose soul is now attached to a metal suit of armor, Ed is fitted with auto-mail parts in place of his lost limbs and becomes a state alchemist by the name of "Full Metal Alchemist." Together, they set forth on a journey to find the Philosopher's Stone - the one item that is rumored to have the power to restore them.
Both the series feature some huge action packed scenes, The unwavering will of Main characters to reach there ultimate goal no matter how much they have to suffer. They wont budge even if they are treated like thrash in society.
Both series feature some unbelievable powers like geass in Codegeass and Philosphers stone in FMA and both series have a awesome storyline.
Highly recomended to watch other one , if u liked any of two.