I honestly thought I hated JRPGs until I gave Etrian Odyssey a spin. I've only played 3 and 4 but I can vouch that the series is quality, and I'm hype for 5 [apparently comes out in October].
If you're on the fence or if you aren't in the know, EO is a turnbased JRPG that makes a point to defy JRPG conventions at every turn. The story is minimal, and the party is created entirely by the player. You get to pick each member's name, portrait, class, skills, equipment, build, and role in the party. Classes are built to synergize with one another and the skill tree is quite complex, meaning no two parties are going to work the same way, even if they have the same classes.
The gameplay is like an old-school dungeon crawler with grid-based movement through elaborate mazes. Since the series has only been released on the DS and 3DS, it makes good use of the platform by forcing the player to draw their own maps on the bottom screen.
Some miscellaneous notes.
EO1-4 are notably lightweight on tutorials, dialogue, and overall bloat, meaning you get more uninterrupted playtime and more of a connection to the party you've made. I've easily sunk hours into it in one sitting, and I'm usually not that kind of guy.
Sometimes you find roaming super-enemies in the maze that will wreck your shit and you have to avoid them. Later on you can come back and kick their ass when you're higher level.
Information and discussion of the games is pretty sparse, so you'll have to figure the mechanics out for yourself most of the time.
Sequels are iterative, and often include quality-of-life changes. The threadbare plot isn't connected between games.
There are remakes of EO1 and EO2 [named 'Untold'] on the 3DS, but they contain story modes with generic characters as well as balance issues. I would recommend against playing them.
The music is truly something special throughout the entire series, with the DS titles having fantastic synth music and the 3DS ones featuring a more orchestral soundtrack. Embed related for a particularly good example.
Most importantly, The portrait set for each game always includes extremely cute grills of different shapes and sizes.