I like very dry humor. I don't like things that are over the top. I like subtlety. I like things that are nonchalant. I like characters that are sort of monotone and based in dark comedy.

This quote is talking about the type of humor that the person likes. They prefer “dry humor” which is subtle and understated, instead of jokes that are too exaggerated. They enjoy characters with a nonchalant, monotone delivery and a sense of dark comedy. This type of humor is usually quite clever and witty, instead of being loud and boisterous.