Eureka Seven
Eureka Seven certainly has a bit of a lighter tone when compared to Code Geass, but there’s still a lot of similarities between the two. The show is a coming-of-age story for a young boy named Renton Thursten, who dreams of joining a mercenary group named Gekkostate and riding the particle waves. Similarly to Code Geass, Renton’s world gets turned upside down when a mysterious girl named Eureka comes to his grandfather’s shop to get her LFO fixed.
Despite being relatively lighthearted most of the time, Eureka Seven tackles some serious themes and can be quite thoughtful on the inner conflict of its characters. As there’s 50 episodes in the series, it takes its time to develop the main characters and build their relationships to others and the world around them. Also, the robots basically surf on the wind with boards, which admittedly is pretty great.