Okay, I'm going to go out onto a very, very thin and brittle limb here (considering the prevailing opinion about Japanese storylines on this forum) and say this:
SIMILAR PLOT DEVICES DOES NOT EQUAL SAME STORY.
I'm so tired of everyone drawling on about how so many Japanese games are either totally fucked up or identical to every other one. If that were true, then we'd see identical character personalities in the same positions (primary, secondary, tertiary, etc.) doing the exact same thing. Sure, there are some games out there that mimic something to the letter, but don't say there isn't anything in the West that doesn't do that also. Look at a few characters I'm going to list off for whatever reason:
Laharl: evil, wants to rule all existence with an iron fist, main character
Marona: sweet, caring, etc., main character
Adell: honorable, fight-happy, main character
Cloud: emo, liar, savior, main character
(Legend of Mana hero/heroine): silent (save for one line), heroic out of mythology, main character
Kirby: similarly silent, lazy, childish, glutton, hero, main character
Link: honorable, randomly destined hero, sailor(?), etc., main character
I know I did mention a lot of characters there, barely scratched the surface (on some), and even didn't mention a lot of others that I could have, but if there is a stereotype, don't forget that there are A LOT of them, so it doesn't really matter.
To be fair, I will say that (at least in recent years) some western games have been getting good, I mean, look at Half-Life, System Shock, Bioshock, Portal, and whatever else everyone is tooting a horn about all the time. But good god, before you say Japanese games are doing the same thing over and over again, look at your own damned country (or hemisphere, I'm too lazy too actually look up where a lot of these games came from, but I assume it's the U.S.): GTA 1-?, apparently the Medal of Honor series is doing the same thing over and over again, WWII games in general, and (speaking of doing the same thing over and over again, the ultimate) grinding MMO's.
Japanese games have their fair share of problems and repetativeness, but I'll go to hell before I'm told that there aren't a fair share of similarly blighted western games.