Modern Fantasy, Urban Fantasy, Sci-fi Futuristic, Cyberpunk, Victorian, Steampunk, Dieselpunk, time period fantasies, semi-realism, slice of life, organization/agencies, gangs, dystopian, dark, comedy, medieval fantasy
My current favorite Anime OP, that passes the vaunted 'would I ever listen to this when not watching the anime' test. (Worth seeing the actual OP and its visuals, Funimation has a youtube vid for it):