If you have a 3DS of any type, there are a ton of great RPGs especially considering the backwards compatibility. Most of which have been named.
One of my favorite easier games that has not been mentioned... relatively short, not too much text, selectable difficulty modes including battle frequency, VA on all the important dialogue bits, and a fairly straightforward story (though not completely linear) is Return to PopoloCrois: A Story of Seasons Fairytale. It is also inexpensive.
My teen does not like RPGs (my favorite genre, huge parental sigh) but has so far made exceptions for Paper Mario games, Mario & Luigi games, Pokémon games, Fantasy Life, and the upcoming Miitopia. Fantasy Life may be a little bit wordy but it has easy to follow quest markers. Miitopia is funny and kids seem to love casting their family, friends, and favorite characters in it. Free demo version is nice sneak peek. We also had a really good time playing Dragon Quest IX together, but that's the only DQ game that they've played. On the PC, they enjoyed Costume Quest, Minecraft, and Slime Rancher. Though the latter two are more sim/sandbox games.
If only there was a Kirby RPG, my kid would lose their gosh-darned mind.