Both muchacho (lead male characters) were part of the up most demon hierarchy.
Both have school, supernatural, action and magic genre.
Both muchachos were orphans and grew up in an orphanage.
Both muchachos were extremely powerful.
And both muchachos have a male sidekick.
In AE the muchacho is an asshole, while in IUD the muchacho is a gentelman.
The muchacho in AE exhibits physical signs of being a demon, while in IUD the muchacho looks whole human.
The muchacho in AE has a sword than contains his entire powers, however, he still