Played Pokemon, 358/2 Days, Final Fantasy IV, and Yugioh on DS. Played Crisis Core, Dissidia Duodecim, and Birth By Sleep on PSP.
Golden Sun: Dark Dawn. It's a great game for the DS. Actually, you should get the first 2 games as well, so you have even more to play.
You should definitely give Golden Sun a go! The first two games are on the GBA though :( You could also try Ace Attorney Super Mario Bro's Pokemon Inazuma Eleven
TWEWY's good. Mario and Luigi Bowser's Inside Story is awesome. Legend of Zelda Spirit Tracks is amazing. 3rd Birthday is good. Persona 3 Portable will last a long time. Prinny 2 is hard as ****.
Fyi, I'm looking for The World Ends With You but haven't seen any copies yet. And should I get Persona for DS or PSP?
PSP, definitely. Persona 3 is really long, and fun. My first playthrough had like 120 hours of gameplay ._.
Yeah the closest place that had TWEWY near me was 120 miles away. Luckily someone sold it to gamestop and I got it the day that it was sold. I didn't know there was a Persona game for the DS. Persona 3 Portable for the psp is and 80 hour game. Great story. There's also a girls side too instead of just the boys story and they're actually vastly different.
[video=youtube;QfGrX0zzVp0]http://www.youtube.com/watch?v=QfGrX0zzVp0[/video] i want this game really badly
If you're looking for a solid RPG you might want to take a look at Disgaea: Afternoon of Darkness (basically the first Disgaea on the PS2) Disgaea: Dark Hero Days (the second Disgaea on the PS2) Both are great games in their own rights with hours of gameplay to keep you entertained.