The King is here! While I was never super vocal about K. Rool, he's a character I've wanted in the game since Melee. He was the first main boss I ever defeated in a video game in DKC1. And based on the footage we've seen, he looks great. I'm extremely excited for him.
If K. Rool doesn't work out, Ridley is another iconic big boss who appears to play exactly like I hope he would. Large hitboxes, uses that tail, and has that amazing side B drag. He's another character I'm very excited for.
Megaman has always been my favorite video game character. His reveal in Smash 4 had me jumping out of my seat. He's tough to get used to playing in Smash, though, so I struggled to stick with him in 4. His pellet buffs look nice in Ultimate, though, and I plan to give him a solid chance again.
I absolutely adore Shulk, and I even have a Gamecube Controller styled with Shulk things. I'm excited about his new Monado art shift buffs, and based on some other small clips, he may be significantly faster in some other places now too. He's very exciting to think about for the upcoming game.
(insert outdated Ugandan Knuckles meme) MY QUEEN! Best Nintendo waifu. I played her a ton in 4 even though I found her fairly underwhelming. Her new buffed counter/reflector looks sick, and she has explosive flame on side B now. I'm excited to see how she feels now.
Last on my short-list of potential characters in Zelda. She's another character I played a lot in 4 even though she was underwhelming. The new animations for her have given her so much life, and I'm excited to try some of those phantom setups. I can't wait to see her pushed her new strengths.