I think I can agree with The World Ends With You. I REALLY need to play through that one again as my memory is fuzzy on it all, but I remember it being super satisfying. I also can agree with Fynn on Kingdom Hearts. I could see why people wouldn't like them (just because I know a lot of people don't care about the story at all anymore), but I think the games often have some really fun battles leading up to the end, and then the endings themselves are just great.

Persona 3 is a good one. It kept true to the rest of the game and had some great impact. I thought a lot about different things after the ending of that game.

Final Fantasy VIII will forever stick with me. It's not the best ending at all, but it has a lot of nostalgic value for me that it always makes me a bit emotional when I see it. I love the music throughout the ending too (including the final battles).