Yeah but do these characters have any personality or function beyond being teenage boys in generic fantasy hero roles?
Your image is biased because you conveniently pick the few western RPG protagonists with personalities of their own over the protagonists of, say, Icewind Dale, Baldur's Gate, Fallout, Wasteland, Arcanum, Morrowind, New Vegas, Ultima, Wizardy, and I could go on and on and on...
Which is precisely what makes the protagonists from those games so boring. Sure, I can pick my dialogue choices (in most of them). Not like they are anywhere near as memorable as the dialogue lines from JC Denton, not even close.
Just accept your image is biased and move on; I'm not interested in discussing the merits of "JRPGs" just like I'm not interested in discussing the merits of "WRPGs".
Ok but you're the one who started
The protagonist of the BG games is the son/daughter of a god, haunted by violent dreams. And he/she can be of any race and class you want.
The protagonist of Fallout is a vault dweller sent out into an unfamiliar post-apocalyptic wasteland in order to save his vault from dehydration. Can be male, female, dumb, smart, a fighter, a diplomat, a thief...
The protagonist of Arcanum is the only survivor of a zeppelin crash, and some crazy cultist tells you that you're the reincarnation of a religious figure. Again, you can be any race and skill specialization you want.
The protagonist of Morrowind is a released prisoner working as an imperial agent, and later on it is revealed he/she is the Nerevarine, the reincarnation of Lord Nerevar... but is he/she really? You can't even be sure about that. Of course, race, sex and class are up to the player again.
These premises are a lot more interesting than anything I've seen in JRPGs. I don't see how any of these are "boring", especially since YOU get to define your character. You pick your race, your sex, your class, and what you say in dialogues.
In a JRPG you don't get to pick anything yet the character premises are LESS interesting than in WRPGs. What's the point of having a fixed protagonist with zero player input when the end result is less interesting than what WRPGs manage to do with full player input?