D.Gray-man

In a world where evil spirits and demons roam, Allen Walker, a young exorcist, stands ready to confront the gathering darkness. With an eye cursed to see evil and blessed with an arm to slay demons, Allen is humanity's greatest hope against the cruel Akuma and their leader, the Millennium Earl. The Black Order, a secret organization of exorcists, defends humanity against the Noah Family, reincarnations of Noah and his twelve apostles who bear hatred towards humanity and God. Allen and his friends must search for Innocence, sentient holy artifacts that possess unique abilities, while battling Noah's demons and facing the dark secrets of their own pasts. But as Allen's journey progresses, he realizes that his connection to the Millennium Earl runs deeper than he ever imagined. Can Allen and the Black Order defeat the forces of evil and save humanity?

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Some TV shows that have similar genres and were produced around the same time as D.Gray-man include Creature Commandos, Darwin's Game, Blue Exorcist, Tengoku Daimakyo, Hilda, Sirius the Jaeger.