I don't mean literally about Halloween, but alot of old OVAs and movies and shyt had a dark, violent tone. Here are some horror anime and others that just have a darker tone/a lot of graphic violence. I'm not gonna post the more well known shyt, like Vampire Hunter D, NInja Scroll, Akira, Elfen Lied (shyt's weak as fukk btw) etc.
These won't all necessarily be close to good, or even have a coherent plot, but they're entertaining if you're just chilling, smoking and killing some time. Please add your own and if this shyt gets any love I'll post more.
Wicked City
Demon City Shinjuku
Late 80s Devilman OVA
Battle Royal Highschool
Angel Cop (GOAT shytty dub)
These won't all necessarily be close to good, or even have a coherent plot, but they're entertaining if you're just chilling, smoking and killing some time. Please add your own and if this shyt gets any love I'll post more.
Wicked City
Demon City Shinjuku
Late 80s Devilman OVA
Battle Royal Highschool
Angel Cop (GOAT shytty dub)