Being able to see each reason that people may have allows us to get better views of these mindsets and demographics. Reading people targeting specific characters allow us to see these thoughts and mindsets in action, so to speak, which allows us to better understand the various reasons that people may not want a character. We can take these specific examples and make them general.
I agree it is dangerous. Very prone to flame wars as was pointed out on the first page, but it's one of the best and most direct ways to better our understanding.
Believe me, I agree. I didn't know where you wanted to take this thread, though. For instance, this thread could just be discussing the indirect reasons people don't want characters, rather than people discussing individual characters themselves. However, if this thread is essentially a controlled think tank of the most civilized form of hate, then I'll certainly step back and let it take its course. And by that, I mean that I'll start contributing reasons I don't want characters in Smash Bros. As usual, I will discuss my dislike for the idea, rather than attack people.
Ghirahm: I honestly don't feel like Skyward Sword did anything really worthy of a playable character, like Twilight Princess before it. Ghirahim is a one-time character who is presumed dead. There are Zelda characters who, should Zelda actually need a new character, have appeared in more than one game and have also contributed to their individual stories.
Palutena: While Kid Icarus: Uprising is an amazing game, most definitely, I don't think the series needs another character just because of one game. I've always felt like Palutena has been a glorified compliment to Pit's character - his driving force, the source of his flight capabilities, his closest ally, his banter partner. While she's a great part of the series, she would take more from Pit than she would offer the Smash series by herself. I don't see her being anything more than a staff-wielder.
Dixie Kong: I have willingly confessed elsewhere that Dixie is a sure-fired Nintendo All-Star who deserves to get in to Smash at some point in the series. But, as of now, her capabilities seem to be nothing more than Diddy+Hair Copter. I am one of the people who has a fear deep down that Dixie could spell the end for King K. Rool, and if that were to be a rational fear, I'd prefer K. Rool get in, no doubt about it.
Krystal: I feel that this character hasn't contributed anything more than a bizarre touch of unnecessary drama to the Star Fox series. I understand that her wielding a staff differs from Fox, Falco, and Wolf having blasters, but an entire unique move set can't balance on the wielding of a staff. Otherwise, I'd be all for Palutena. Also, the idea that she deserves to get in over Wolf/Falco on this staff idea is a little irritating, considering the fact that it isn't "Rosalina is a puppet master" levels of ingenuity like some would like to believe.
Any Metroid character other than Ridley: The isolated nature of the Metroid series disallows a whole lot of interaction with other characters. As a matter of fact, the only real constant interaction that Samus has is with the bane of her existance, Ridley...who has more than proven himself a Nintendo All-Star (for crying out loud, he's a recurring enemy at the Nintendo Land theme park!). If another Metroid character got in before Ridley, I would be so ticked, just because he has literally been there from beginning to end, while almost every other character has simply existed temporarily.
If I think of any other characters (that aren't Impa or Third-Party, since I already posted those thoughts here), I'll be sure to return to this thread.