I really want to play a Final Fantasy game at some point, but always seem to find something else play. Same thing goes for Dragon Quest games. I could ask everyone here which game from each series you recommend, but would I actually play it? Probably not. 😔
As for a single game I own, I will probably never play Disgaea 5. It's been so long since I bought it.
FF7 was one of the few games I had for the PS1 so I played it through multiple times. Never beat Ruby or Emerald though, having to grind out multiple Mimic or Knights of the Round was just brutal.