A huge majority of anime feature younger characters so I decided to look for some that have adult ones. These characters are 18 or older and are experiencing the wonders of adulthood. Let me know if I should add any more.
If the anime was never completed, Then you're in luck. You can continue the story by reading the completed manga. This list has basically the same rules as a couple of my other ones, includes anime originally based on a manga, no...
A list of manga that has been adapted to/from a live action movie or drama. Key: follows Web Country Code.