I felt so bad for Riku, He tried so hard to save Kairi its just that nothing worked. Also he was being munipulated by that witch. I don't believe that he ever really enjoyed fighting Sora, but he was told that he had to in order to save Kairi's heart. Later he was possesed by Ansem, but was still not completely evil. He wouldn't let Ansem harm Kairi, even though he was possesed he fought him off so that she could escape. He is a classic example of a Tradgic Hero. He was good at the end too. I really like Riku. He was a little mysterious, which always makes the game more interesting. It wouldn't be Kingdom Hearts without Riku/