In this, I will be ranking them based on their design.
This is a hot take, I just don't like how Wario looks, he literally looks like a try-hard Mario on drugs. He has a weird mustache wirh a butt-cheek-chin, and doens't help with the fact that he can EAT PEOPLE, ahem, I mean, chew. Wario gives off "ew" vibes, which is exactly what he is, one of his taunts is literally his SHOWING OFF HIS ENTIRE BUTTYHOLE, like seriously, wtf!? He is also a little...chubby and his shoes have a weird shape, I just don't like him. I know this sounds weak, but I just don't like Wario's design.
He is a a little ugly in my opinion. He looks heftier than his nemeses, Falco and Fox. His color of purple is a bit too much, but honestly, no other color fits in, so I guess that's a pass. His blaster's design really carries him. He doesn't have that great of a design compared to the others.
King K. Rool looks a little bit like a overweight, drunken alligator king. Oh wait, that's exactly what he is! He literally has a golden belly, with a belly-button, something crocodiles don't have, and it's kinda disturbing. He also has a mishaped eye that looks like he bot poked in the eye by a needle. His designs decent after that, but it's still a bit weird.
I just don't like his design, especially some of his skins/counterparts. Morton's my favorite, and that's saying something. Wendy's my least favorite, due to all her makeup and I just don't like the color pink mixed with a Koopa, it's just downright ugly. The clownkarts actually help. They are pretty ugly, but they have their own emothions and act alive, which is a pretty cool detail.
Dark Pit is litterally just pit with black clothing instead of white. He's only slightly different, with his Final Smash and his Side-Special. Other than that, he's just your typical echo-character, a cruel, mature acting Pit. The thing I like is that his staff is actually used, but as a final smash. Also, I like Pit's design in general, it's just they could've changed Dark Pit a little bit more.
I don't know, Im just not that big of a Dedede fan. His moveset sucks, check it out here. He is just a fat blue penguin king. Though, he has funny moments on screen, like a "crouch", that is actually him chilling on the floor. No need for taunts, just move the stick down and viola, make your opponent rage. He can either look like he's on the joyful side, or look like a madman, or is it madpenguin, anyways, yeah, I'm kinda just neutral about him.
Now this is an intresting one. He's an intresting choice Sakuri chose to add as the first DLC character. Not anyone like Sceptile, Ori, Hero, Terry, but a MINOR enemy, turns into one of the best characters in the game. He even has tiny little feet at the bottom, so that's fun. He may not have enough personality, but that didn't stop Sakuri from adding him, then again, Pyra/Mythra, Kazuya, and Steve exist, so we don't know what was going on in his mind. Anyways, sorry Sakuri, he's very basic, but I like how they made him a unique, playable character.
He's an original desin of nitendo, and it's great how they managed to mkae great sprites for 3d, pixel, and the animated movie. Bowser's design is really good, a big turtle with spikes, spiked braclets, and breathes fire, they went absolutley great with a villianous design. Though, that's not compared to the rest of the others...
Sephiroth is a cool character. He's an angel who has only one wing, increasing people's intrest in him that haven't seen him before. He has one black angel wing, a nightmare coat, and a very, very long sword. He has long white hair, a cool, mischeavous look on his face. I don't know what else to say, but he just has an excellent design.
She's a bit disapointing, as an echo character, she's just a different design completely, which is why she's on here. I just love Dark Samus's design more than Samus's for the actual differences. She's rougher on the edges and look's more...veiny-looking. She has a lot more sinister looks than Dark Pit. She's not on the top due to being an echo-character.
Ganondorf gives off "Lord of Darkness" vibes, which makes him a great character design for a villain. Whoever was making the original and new sprites for Ganondorf. He looks like a true villain or darkness, more than Dark Pit, Dark Samus, and even Bowser. He's not the best by my opinion, but he's top 3 here, though the next one's kinda biased, so brace yourselves for some bad opinions.
He's my main. YEah, I know right, surprising. He also looks like a pterasaur-dragon mixture, which are the two things I love. So yeah, a very, very biased opinion. They also managed to get him in the game due to his actual size, which is like, 4 meters tall, which is also about 13 feet...ish. But, for the internet's sake, I will state some cons with his design. His texture is a little bit weird, a bony creature, kinda like me, no meat. Though, not even biased thoughts can save you sometimes...
He's the best designed villain, besides Meta-Ridley, but he doesn't count, in all of ssbu. He is literally Kirby, but darker, and is a knight themed character. He has huge wings instead of just pumping like Kirby, he actually speaks, he is very omnimous with his helmet, and he has a cool cape that helps him disappaer like John Cena, but cooler, sorry, John Cena.