+ Ouran High School.
I'd have to say is my favorite of all favorites <3. It's adventurous, romantic, and oh so comical. I laugh for days afterward watching the anime. I am planning to read the manga once I get my hands on some money and buy them :D.
Oh, and my favorite characters (hands down) would be the twins, Hikaru and Kouru. They're a blasty blast<3.