There's only 10 days left till it's Halloween! So during this time, I would like talk a bit about some Halloween themed anime (coz we r all weebs).
Halloween anime include some features such as demons, monsters, spirits and any other supernatural subjects (or can just be scary). Some great Halloween anime are Demon Slayer, Soul Eater, The Promised Neverland and B: The Beginning. Even though anime with monsters and supernatural events are automatically Halloween themed anime, it doesn't necessary have to be horror or thriller. For example, Demon Slayer. Demon Slayer has a little bit of thriller in it, but it is mainly adventure and action.
Sometimes, an anime is not Halloween themed, but there are some scenes and arcs that have Halloween themes, such as Thriller Bark arc in One Piece. But overall some scares and some horror and thriller are quite good, even in comedy and slice of life anime, or so I believe.