Western RPG's have choices and consequences. That's the fundamental difference for me.
Yep glad you brought that up I mentioned this before about JPRGs. People always wonder why their childish, or have teenage protagonists. It's simple different cultures.One of the fundamental differences is the ages of their respective target audiences, which is reflected in the types of stories, characters and writing one tends to find in the games. JPRGs are, in general, made for a younger audience. Doesn't mean they suck or even that they're unsophisticated (though many of them are), but it's true. There are exceptions (Nier, Fromsoft games), but they're few and far between.