Unbeknownst to me at the time (I must've been between 7 and 9; I was born in 1983), my first RPG was Willow on the NES. But I didn't truly get into the genre until the SNES, when I discovered Secret of Mana. The ad/poster in a magazine caught my attention very easily. It looked something like this, of course:
Anyways, the game had a big impact on me. If you saw that intro sequence with Fear of the Angels playing back in the day, you'd understand why too. I think it was probably the first time that I found a game 'beautiful' as well as moving on an emotional level. From there, I was pretty much hooked on the genre. I would soon play Breath of Fire, Breath of Fire II, Ogre Battle, Illusion of Gaia, Lufia, Lufia II, Final Fantasy II/IV, Final Fantasy III/VI, Earthbound, Chrono Trigger, Secret of Evermore, and Super Mario RPG before jumping into the 32-bit era.
Jam it back in, in the dark.