Top 4 in Top 10 best fantasy anime similar to Attack On Titan you can't ignore.
Hellsing Ultimate Fiction Anime Trailer
Hellsing Ultimate is the best fantasy anime similar to Attack On Titan, although it is only ten episodes long, it is known as one of the best vampire anime today. The plot focuses on the Hellsing organization that specializes in destroying supernatural forces that are endangering humanity. The head of the organization is a powerful woman who commands the army. More specifically, her biggest weapon is a vampire named Alucard (it's "Dracula" spelled backwards).
Hellsing Ultimate shows the darkness through what it conveys: sometimes things are not as we imagined, "the greatest weapon is also the most terrible nightmare" that a person has to experience.