Samurai Deeper Kyou, Nurarihyon no Mago Recommendations
Both have the human yokai transformation for the main character, with alot of mystery of the relationship between the yokai part and human part of the main character.
Well, both animes have yokai and the main characters, Demon Eyes Kyo of the Mibu Clan and Rikuo Nura, look similar in their transformations. Also, they both have a sweet alter ego that turns into a sword wielding yokai killing alter ego. In the subject of alter egos, both characters' alter egos can be considered the alter ego of the other.
The main charcter goes through a tranformation and his appearence is similar.
-both charcters carry swords that are unique
- 20+ episodes!
they both have the same feeling when you watch them