as gore and overtly violent elements are kept to a minimum. That's begun changing more and more due to the rise of the "dark shonen trio," but even then, these works pale in comparison to Berserk.
Mostly importantly, the art (and the gore it portrays) needs to match Miura's manga, as these elements are why fans liked the series to begin with. As time passes, leaving the 2016 Berserk anime ...