This should be fun to think of
GB: Pokemon Red/Blue
GBC: Pokemon Crystal (I haven't played many early RPGs)
N64: Paper Mario
GBA: Mario & Luigi: Superstar Saga
PS2: Kingdom Hearts II (followed by Final Fantasy X and Dark Cloud 2)
GC: Paper Mario: The Thousand Year Door
Xbox: The Elder Scrolls III: Morrowind
DS: Mario & Luigi: Bowser's Inside Story
PSP: Kingdom Hearts: Birth by Sleep
Wii: Xenoblade Chronicles
Xbox 360: The Elder Scrolls V: Skyrim
3DS: Pokemon X
If a system isn't listed, it's because I haven't played an RPG on the system. RPGs aren't my most represented genre, especially on home console. Note that I played Birth by Sleep and Xenoblade Chronicles on PS3 and 3DS respectively, but I didn't want to count ports.