I got a couple:
1. Sora slicing trough buildings in the final battle of Kingdom Hearts 2. Doing that for the first time with the epic music in the background is something i could never forget
2. Sora Donald and Goofy being silly. I just love those three and how silly they can be sometimes!
3. Lingering will fight. Such a hard fight but so fun to learn.
4. Sora's speech in Dream Drop Distance. His speech just shows how mad and sad sora is at the same time but still keeps moving forward cause he has his friends power with him. Add the Link to all music with it and you got one of the best scenes in the whole series
5. Kingdom hearts 2 ending. Speaks for itself really.
6. Whenever you would go to halloween town. HT is still my favorite world in the whole series. So sad it won't be in Kingdom Hearts 3