The real answer is most of clones, semi-clones and echoes. But Top 3 probably should be Dark Pit, Roy & Dr. Mario. Or Daisy I guess.
Dr. Mario really wasn't a thing Nintendo pushed that much, heck they still rather use Metal Mario in MK. Roy is sad, because he is most unique of Marth "clones". But he absolutely got in due to marketing. People actually hate his games in Japan, so he might the one character nobody would have ever rooted for had he not been in Smash.
Dark Pit is really bad due to circumstances. Smash 4 was a big love letter to KIU, mainly due to porting, but still, it got so much more love than other franchises. Why should KIU get more love than DK, Metroid, Yoshi, Pikmin & Wario combined? And then Sakurai cherry picked one of his franchises to get extra character, because "Dark Pit wouldn't use 3 Sacred treasures FS" but Alph apparently is fine using Olimar's FS. Awful. And even those who wanted him, rather wanted him to use unique KIU weapons. Dark Pit was implemented badly.
Other than that, K. Rool & Ridley took way too long to get in, but roster as of now is fine, although Kirby & Zelda could use more reps.
Why do so many people hate Wii Fit Trainer & ROB, when Mr. Game & Watch is fine? Also, Miis seem universally hated which is weird.
I might defend Pichu a little here, but since he is the only Gen 2 rep that's actually something notable. Lucina/Chrom, Dark Pit, Dr. Mario & Daisy are way more wasteful than that.
After Ultimate tho, removing characters doesn't seem like a good idea… So, we are stuck with Dark Pit. Bleh
Dr. Mario really wasn't a thing Nintendo pushed that much, heck they still rather use Metal Mario in MK. Roy is sad, because he is most unique of Marth "clones". But he absolutely got in due to marketing. People actually hate his games in Japan, so he might the one character nobody would have ever rooted for had he not been in Smash.
Dark Pit is really bad due to circumstances. Smash 4 was a big love letter to KIU, mainly due to porting, but still, it got so much more love than other franchises. Why should KIU get more love than DK, Metroid, Yoshi, Pikmin & Wario combined? And then Sakurai cherry picked one of his franchises to get extra character, because "Dark Pit wouldn't use 3 Sacred treasures FS" but Alph apparently is fine using Olimar's FS. Awful. And even those who wanted him, rather wanted him to use unique KIU weapons. Dark Pit was implemented badly.
Other than that, K. Rool & Ridley took way too long to get in, but roster as of now is fine, although Kirby & Zelda could use more reps.
Why do so many people hate Wii Fit Trainer & ROB, when Mr. Game & Watch is fine? Also, Miis seem universally hated which is weird.
I might defend Pichu a little here, but since he is the only Gen 2 rep that's actually something notable. Lucina/Chrom, Dark Pit, Dr. Mario & Daisy are way more wasteful than that.
After Ultimate tho, removing characters doesn't seem like a good idea… So, we are stuck with Dark Pit. Bleh