FF1-FFX. Haven't liked another RPG apart from Paper Mario since.

Mass Effect for me as well. Couldnt ever get into RPGs before ME and cant really get into them too much since... heres hoping andromeda is great

Fire Emblem, as long as that counts.

Dragon Quest..hands down being the only turn based RPG left...

I'm a big fan of Final Fantasy, but not because of specific games, but the series as a whole. I like almost any games in that series, even spin offs. The only thing I don't like is that SE puts that brand onto everything just to sell it.

As a JRPG gamer for many years now, I have lots of series I play and love so my list will be rather big so I'll try to limit mine to 15 in no real order :D

Dragon Quest
Final Fantasy (Recent entries have really downgraded the series for me)
Fire Emblem
Pokemon
Tales of Series
Ys
The Legend of Heroes (Is growing as one of the best jrpg series imo)
Lunar (The first 2 are some of the best the genre has to offer)
Paper Mario (Other then Sticker Star the series is great)
Mario & Luigi
Disgaea
Golden Sun (Still hoping for a 4th game on the 3DS before it's lifecycle is up!)
Suikoden (Mainly the first 2 games)
Grandia (Same as above)
Shining Series

*Note* These are subject to change each and every year that newer series or entries come out.

Xenoblade by far, then Suikoden and Lunar.

Shin Megami Tensei, Pokémon, Mario RPGs in general... I need to get into a lot of others series yet, though, specially some western ones.

Fire Emblem and the two Xenoblade Games (if those can be called a franchise).
Aside of those, Mass Effect.

Tales is my #1