Super Mario RPG
Chrono Trigger
Final Fantasy IV
Final Fantasy Mystic Quest
Final Fantasy Tactics Advance
Paper Mario
Sailor Moon: Another Story
Dragon Ball Z: Legacy of Goku series
Mario & Luigi Superstar Saga
Knights of the Old Republic series
Also, while not retro, there are the Knights of Pen and Paper games, which are RPGs where you're a bunch of players playing an RPG. The big thing is that you can make the difficulty whatever you want for that.
And if you consider the 360/PS3 era to be retro now, you have the Elder Scrolls, Fallout, Dragon Age, and Mass Effect series, where the difficulty can be turned down to a cakewalk.