Duel Action
-Super Smash Bros
I don't need more characters or anything, just let it support WiFi and well balanced, because balancing of JUS horribly failed and left an impression of Smash Bros clone with Jump skin.
I guess just simple PORT would satisfy me.
RPG
-FF5, FF6 with FF3DS engine (Rumor says 4 is on the way so)
ARPG
-Some decent Sword of Mana (Either 3,4, or legend of Mana)
because Children of Mana was just soso... I hated the bouncing everything, Heroes of Mana is... a miserable RTS. They should have swapped game play concept of FF:RW and HoM, because FF would sell no matter what, but HoM wouldn't due to a soso experience on DS)
-Shining Soul 3 possibly? Remaking a GBA game would be the dumbest thing you could do, so how about a 3
SRPG
-Langrissar 1/2 from MegaDrive, not Super Famicom
For some reason I don't really like Fire Emblem because weapons get used up and characters die. But if FFTA2 stands up to my expectation, I would just run MD emulator on PSP instead
-And as intet mentioned, Shining Force series would be nice too.
But I have trouble figuring out why some of these games would need 2 screens in the remake. The top screen very likely will be a minimap or character status window, which isn't really necessary -pressing start button isn't that hard-
Actually you know what, can racing games have 1:1 feature that uses 2 screens instead of split screen? Could be fun, you can learn other people's driving techniques that way, and don't need a back mirror when they are tailing you.