The Ouran High School Host Club manga is indeed complete. It wrapped up with all the storylines resolved and characters' arcs concluded. Fans got a satisfying finish.
Well, friendship is a big theme. You see, the characters in the club already have a unique bond, and in fanfiction, it can be further explored. Maybe how they support each other through tough times at school or in their personal lives. Also, the theme of self - discovery is common. Haruhi, for instance, is constantly learning about herself and her place in the club and in the world. Fanfiction can take this concept and run with it, showing her growing and changing in different ways than in the original series. And of course, there are fanfictions that center around the comical situations the hosts get into, just like in the anime, but with new twists.
It's hard to give an exact number. Different editions and reprints might vary. Your best bet is to look up on dedicated manga databases or forums where fans have likely discussed this in detail.
Sure. The Ouran Host Club manga has finished. It had a proper conclusion that covered all the important aspects and left a lasting impression on readers.
One interesting plotline could be a forbidden love story within the host club. For example, a character might fall in love with someone who is from a rival club or a person that the host club 'rules' say they shouldn't be involved with. This could lead to a lot of secrecy and tension in the story.
Haruhi is definitely one of the most interesting. Her unique situation of being a girl in a male - dominated host club offers a lot of room for creativity. Tamaki is also great. His over - the - top personality and his complex relationship with his family can be really engaging to write about. And then there's the twins, Hikaru and Kaoru. Their codependent relationship and their journey to find their own identities are really fascinating topics for fanfiction.