Just to name a few:

Lunar series
Wild Arms series
Suikoden series
Various Final Fantasy titles
Thousand Arms
Tactics Ogre
Tales series
Xenogears
Skies of Arcadia
Lufia
Mario RPG
Chrono Trigger
Chrono Cross
Hoshigami

Best games of each series IMO
Baldurs gate 1 first rpg i played, loved it! best one of the series for me.
Fallout 2 replayed this one sooo many times. good times
Fallout 3 meh compared to 2
FFVII replayed this one many times, sephiroth is the baddest boss ever
FFVIII loved having a flying saucer ship lol
Oblivion
Twelve Sky 1 (the old one) MMO
Mu Online
Skyrim
Prototype was a good game

And obviously Diablo1, 2 and probably 3
Diablo 1 will always hold special place in my heart because this game was my first ever online game i played. all those 15 long years ago!
Diablo 2 i played with my real life friend and had some funny times playing it and duped shit loads of soj's! when they were valuable.

Fucking right. I was worried that it took over a page to see this posted. Put this at the top of your list.

xenosaga
paper mario
mario rpg
FF series