Kingdom hearts is my favorite video game series of all time.  I always make sure to buy a console for a KH game if it's on a system I don't have.  I love it because it is both anime and Disney.  Disney was pretty much my whole childhood.  So if it wasn't for Disney and kingdom hearts, I probably wouldn't be an anime fan today.  If I had to choose only one out of all of them to be my favorite I would have to say KH2.  I know that game a lot more then the others.  I've beaten that game so many times that I lost count. Another reason why it's my favorite is because it was the first KH game I ever played.  I like the KH1 theme song a lot more though.