Eureka Seven, Comet Lucifer Recommendations
Similar atmosphere and world.
Similar young main character who loves discovery, tech and hover boards.
Both shows have a mysterious young girl who seems out of this world and plays a major role in the plot.
Comet Lucifer almost feels like a little brother to Eureka Seven (that's a polite way of saying that it very clearly copies many of its aspects from ES). The worlds are very similar with how they're structured- mechas, hoverboards, semi-futuristic with a group of characters who live together and explore the world. The main characters from both shows parallel each other almost shockingly well. It's almost like the writer for Comet Lucifer got most of his ideas from Eureka Seven. Lastly, the art styles are almost exactly the same. None of this is a knock on Comet Lucifer at all, but it's easy to tell