Code Geass: Hangyaku no Lelouch, Yu☆Gi☆Oh! 5D's Recommendations
Yusei and Lelouch live in an ordinary life in areas that are under oppression (Satellite and Area 11) only to involve a bigger journey where they form their teams (Team 5Ds and Black Knights) to change the world. 5ds and CG have plot twists, thrilling moments, sad and depressing themes, action, and morality that will keep you on your toes in all times just like I have. Note that Aki looks just like Kallen! Rival is the same as well as their cast.
There are quite a few characters in Yugioh 5Ds who are obviously heavily influenced by, if not complete copies of, characters from Code Geass (the most notable example being Akiza, who's REALLY similar to Kallen). Also, both happen to have similar styles of animation, and the main characters of both happen to have a special power involving a red mark (Yusei has the mark of a signer, Lelouch has his Geass).
Also, it's obvious that the redhead from each series is in love with the main character of each series (Akiza is obviously in love with Yusei, and Kallen is in love with Lelouch, although