None.

A character "falls down a cliff" (offscreen) but it is hinted that he was actually beat up badly by another character.

As characters are harmed there is sometimes blood shown, however there is usually very little of it.

"Hell" "Damn"

It is implied that some characters drink beer (or want to).

A character becomes drunk (accidentally).

There are various spirits and other mythical creatures that are enshrouded in darkness.