Regardless of whether it's Frisk or Sans, a lot of people seem opposed to the idea of Undertale getting in... does it all tie back into the idea of "rrgh competition rrgh" but it's dressed up with excuses? After all, competition is more likely than not one of two primary reasons people bash others' favorites (the other is trolling to get reactions). Regardless of any individuals, I wouldn't doubt for a second that at least a few people opposed to Undertale don't want it in at least before another indie, usually Shantae, Shovel Knight, or Touhou (I don't often see this with Cave Story's Quote, though). It might be because they see the other series' popularity as more "genuine" than Undertale's, or something else, but ultimately it's a matter of competition that drives this feeling. The idea of the "First Indie in Smash" not being Shantae/Shovel Knight/Reimu and it being Frisk/Sans, that might stur up some who wouldn't be as accepting of it as most folks here. Not every Shantae/Shovel Knight/Reimu fan would blow their lid over Undertale in Smash (primarily with a fighter) before any of them, and I suspect almost everyone here is mature enough to understand that just because X character gets in, doesn't mean Y character cannot. But in the speculation scene, it's confirmed or disconfirmed.
I think this ties into the core issue of the assumption that we can only get one of one particular type of character per game. We can only get one character of X genre, from X company, from X series, we can't get any more new series characters, we can't get any more veteran series characters, that type of stuff. Speculation about who gets in often means that if your favorite doesn't get revealed, it's likely that either they're an NPC or absent. And with the way third parties are, if your most wanted is one of those, you likely have to wait for the next game if you see competition get in before your character. With that in mind, I do understand seeing competition in a poor light.
It's why I was bitter at Joker at a time where everybody else had only good things to say about him aside from others like me: people who felt entitled to somebody else of Atlus' libraries, and likelier than not, of SEGA's libraries. It'd probably be the same thing if Tails, Dr. Eggman, Jeanne, Kazuma Kiryu, NiGHTS, Billy Hatcher, Alex Kidd, Jack Frost, Yu Narukami, Vincent, any of them would just be the same and replace Joker as the one I lash out at for not being Arle (and if SHE were to get in, I imagine less mature fans of the other characters would probably do the same to her). I don't attack FANS of Joker, I was just bitter: I overestimated how likely she was, didn't take into account that it applied to her competition too, and walked away feeling bitter about the Game Awards 2018. What Persona 5's fanbase likely holds as a milestone in their circles, for me was a dark day: Arle had become a hard sell to many people. Before, I honest to god saw her as a near lock: the only threat to her chances was the person confirmed in that event. The only person who really made her less popular as a pick had gotten in. Now I'd likely be considered a fool for even thinking she'd get in at all here, in less welcoming places. My best bet is something I'm convinced is not happening, a second pass, and there's no guarantee she'll be in it as well. It's, as I will admit, unfairly soured my view of a character that, when I don't take that into account, is amazing. Truly wonderful. The attention to detail, the beauty in his animations, the sheer passion for Persona 5 Sakurai holds is plainly visible with Joker and Mementos. But every time I see him in action, every time I see him fighting Kirby, going through Classic, fighting bosses, doing anything, and sometimes, even when I see Mementos or hear a Persona 5 song: my first thought is, regardless of severity, and sometimes even when I try not to: "That could've been Arle", which if unchecked, will lead to "That should've been Arle" and "Why is it him and not her?" I don't need to vocalize my displeasure at that any more than not purchasing the Fighters' Pass, I never do externally: it's always that internal bitter feeling. I try to downplay Joker's presence in Smash to mitigate this, but when he was the new hotness it was really hard. I like to think I've improved and gotten over it to many extents, but that first wound still burns quite a bit. I'm nowhere near as upset back when he was revealed or released, but it is still hard to like him when I think about how for a moment, Arle could've been happening.
I imagine I'm not the only one feeling this way, but not about Arle necessarily: I imagine this is where Incineroar got most of the heat from, stuff like "WHY THE **** IS IT HERE" when it was the face of the Box Theory, the cynic's choice vs the optimistic Grinch Hoax. It might've happened with less mature Dixie fans, and if Dixie and K. Rool were swapped at this point, I'm sure the outcry would be immense. It's why Banjo and Steve fans are constantly at war. It's why fans of nearly every Square Enix property that isn't DQ are fearful of any leak involving Erdrick. It's the idea that your most wanted character could be the next one shot down by competition. It's the idea that only one can happen, and if there's only one, then everybody's gonna fight over it, when that's not really what we SHOULD do. The idea of there only being one of X has never been confirmed: in fact, the Bowser Jr./Rosalina case is one that is slowly starting to bring me hope. The thing I can at least take solace in is that an Assist Trophy might be an upgrade to not being in, a Mii Costume is likely an upgrade to not being in, or even a Spirit would be an upgrade to not being in. Isaac fans learned this lesson in Smash 4, and now I can truly see it. And, yes, don't think I haven't taken into account that I'm simply too passionate about both Puyo Puyo and Smash Bros. in particular. I likely am, and so are many people who get overly worried by competition.
But I would never consider sending a death threat to somebody who wanted Tails or Kiryu or Jack Frost in. That's egregious, and horrific to boot. It's not wrong to hope somebody gets in trouble for something they can't take back. Being unhappy with a character is one thing, but being so unhappy you have to take it out on people who are? That's just really lame. I promise that I would never attack a fan of Joker or Persona 5, for any (Smash related) reason, regardless of how I feel about Joker getting in first. And I really feel that more people on Twitter, the GameFAQs Ultimate board, and some other places could stand to learn this lesson.
...this was supposed to be a continuation of how Undertale and its fanbase are terribly treated by the Smash community outside of here, and it became a rant about how competition turns Smash speculation into a hellhole if people get too worried about it.
* If it were to turn out a particular fan of Joker/P5 has done some pretty crappy things, then I would probably not feel bad making fun of them, but I probably wouldn't attack directly outside of call outs.