If you liked
Death Note
|
...then you might like
Code Geass: Hangyaku no Lelouch
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These two animes are similar because of the main characters who share the same villianous qualities. They both seem to want to create a better world with their new powers that they required, the Death Note from Ryuk and the Geass from C.C. Light and Lelouch's names both start with a L :P and they seem to be very intelligent, planning every attack by using their pawns precisely. Both of them have their own followers and share a tight bond with at least one of them, Light and Misa and Lelouch and Kallen. Also they both appear to have their identity a secret with only a handful of people knowing and use a God-like name to be known as, Kira being Light and Zero being Lelouch.
If you liked
Kidou Senshi Gundam SEED
|
...then you might like
Code Geass: Hangyaku no Lelouch
|
Eventhough the characters themselves aren't that similar except for Princess Euphemia and Lacus and their pink hair, the relationships they have are pretty much the same. The friendship between Suzaku and Lelouch with them being on different sides of the battlefield are the same with Kira and Athrun being on different sides, one on ZAFT and one on EARTH Alliance. The relationship between Kira and his sister Cagalli are to the same extent that Lelouch shares with his half sister Euphemia. And also the romance between Cagalli who is a natural and Athrun who is a coordinator is similar to Euphemia who is a Britannian and Suzaku who is an eleven. The only similarity isn't just the character relations, but the show itself because both Gundam Seed and Code Geass have mechas that are used as the primary fighting weapons.