Rin Okumura has always been a problem child. He lives with his adopted priest father and twin brother Yukio, and has a knack for finding trouble. One day, he started seeing strange things and being targeted by what seem like monsters. After his adopted father is possessed and killed by Satan, Rin discovers he’s the son of Satan. Determined to seek revenge on Satam, he becomes an exorcist, only to learn from his twin brother Yukio had already become an exorcist. As Rin battles against his demon powers and earn the respect and trust of those around him, he still forages on. Blue Exorcist not only focuses on our protagonist Rin, there's also a good amount of side character development. The art style is so beautiful, and all of the exorcist classes and powers are just fascinating. Blue Exorcist is also the fandom that has a lot of good, quality fanfiction.
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(Also known as Ao no Exorcist)