NES: Final Fantasy, even with being inspired by Dragon Quest it nonetheless was a huge milestone for RPGs
SNES: A Link to the Past; by now people should already know I see Zelda as not just Adventure but Adventure RPG
PS1: Final Fantasy VII
PS2: Final Fantasy X or Kingdom Hearts
PS3: Probably the Souls games? They gained a lot of popularity
PS4: Final Fantasy XV

For ME:

NES: FF1
SNES: FFVI
PS1: FFVII
PS2: FFX/KH
PS3: Nier Gestalt
PS4: Nier 2 Automata

GC: Twilight Princess, WiiU: Breath of the Wild as I won't count TP again, PSP: Crisis Core, etc.