Author's Notes
Alright, so I haven't updated my Fairy Tail/Gravity Falls FanFic in a while. One, because I've been keeping up with my college classes as well as I should be (which combined with my job, leaves time for little else). Two, because it's more or less remained ignored. Three, I've gotten a little bored with it.
The fourth reason, however, is the story you've opened just now. I haven't watched or read much of Naruto, nor have I played Undertale. However, I've read up on the Naruto universe through TvTropes and other FanFictions on this site (I would recommend "A Growing Affection" by Xavon Wrentaile). Moreover, I've also read up on Undertale through TvTropes, and I saw a well-done web animation called Glitchtale.
Suffice to say, I've learned enough about both fandoms to fall in love with the characters (and stories) of both. Naruto is an anime that is arguably the greatest work of art among its medium, and Undertale has absolutely achieved that feat in the area of video games. So, if Gravity Falls and Fairy Tail are among the best in terms of their artistic quality, Naruto and Undertale are the sort of stories that, if they aren't each the best of their mediums, then they must be somewhere in the top five, if not the top three.
My point is that these two franchises now have my attention. And once I learned about both, my muse furiously raised its hand like a teacher's pet with an important question, and then proceeded to spit out the main idea that inspired this story.
Sadly, I have more homework to do for today, and tomorrow I have work for the first half of the day. But hopefully I will be ahead of my workload soon enough, and then I can start writing again. So, rather than waste any more time rambling, I'll share the bedrock concept for this story.
In short order, this story will place the universes of Naruto and Undertale on the same planet, with Undertale taking place on an island near the Land of Water. Moreover, the monsters of the Underground will be the results of all the Tailed Beasts and other super-powerful demons having children with mortals (a lot like the Greek/Roman gods did). That will explain how monsters can wield magic/Jutsu (this story will treat them as the same thing) with as much ease as they do in Undertale, while humans can't do squat (like Frisk) unless they're trained to use Chakra (like all our favorite ninjas). Moreover, the monsters were locked away in the Underground largely out of prejudice, but this story will have them live there long enough for Naruto's generation to not really care about the reasons for their imprisonment (mostly).
Also, since this is one of my stories, it will contain a lot of improvised head-canons that, though they aren't official, are designed to make sense of this crossover's mixing story elements. So if something seemingly contradictory to either story's lore happens, just chalk it up to an AU-type difference and keep in mind that it will most likely be explained in time.
Finally, there are a few things I need to clarify right away. First, I am characterizing Frisk as a boy and Chara as a girl. After all, Chara's overall characterization fits the bill for a girl (the warmer-colored shirt, the feminine blush on her face, the cut of her hair, etc.). Moreover, Frisk doesn't really seem that way at all. It may be left ambiguous in the game, but cooler colors (like the bluish-purple of Frisk's shirt) are typically indicative of a more masculine/boyish style, and his facial expression definitely seemed like more of a boy's face (seriously, how many girls have you seen that walk around with this look on their face: -_-). But most importantly, the description given for the cowboy hat is a dead give-away. To wit, what the Hell kind of a girl would "...want to grow a beard"?
I'm not trying to be a misogynist, or base my decisions on clichés. I'm just trying my best to flesh out Frisk and Chara as separate characters. Sure, they share a body in the game's time-frame, but they still started out as separate people. The difference in gender is just my way of capitalizing that difference, because it's going to be a big plot point during the first part of the story.
So, that's all I really have to say. I hope I'll get a more active response this time around, since this story's POV character won't be a Deconstructed Mary Sue (like the main character of my other crossover FanFic). Just let me know what you think and I'll see you in a few days or so when I release chapter one.