Just anyone you have in mind that I haven’t brought up. Though I do want you to consider how they’d work in karts and bikes if you have any unorthodox choices.
I was thinking a more blue-ish silver like the sprite, and it’d be sparkly too to make it more noticeable
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Oh, that works perfectly!
Okay, so, you obviously know I'm a fan of odd series.
-Brian(Quest 64). This is a difficult one for a Kart. They're just a regular human, but the Kart type could have a castle-like exterior. Akin to what you can do in Lego Racers. Mostly to show he's a medieval badass. Light or Middleweight. He's only 4 feet tall. But also is like 15 years old.
-Fulgore(Killer Instinct). Still a humanoid, the matter is what kind of Kart. I want to jokingly say a Gargos Kart, since the former is generally the boss before the final boss, but. Likewise, Glacius-inspired Kart is eh. He himself has a lot of stuff from Ultratech, and one based upon electronics and such, to look like a technology nightmare is perfect. Definitely a heavyweight due to being a robot. Also, it has two designs. Classic and 2013.
-Nipper Plant. I suggested this before. What would be neat is that it'd be in a skateboard-like one(or a motorped, I guess), and be a clear joke character idea. The idea is that it would have poor handling/turning due to a lack of arms and such. Same issues with Goombas having no arms, if you will. Lightweight, of course.
-Mostly a joke from Zelda Kart, but I would love to see a Horse in a Kart. Just a silly thing. Not necessarily Epona either. Could be just about anyone from an unused series, as long it would fit. Like one of the Knight characters from Shining Force for a joke option. Heavyweight, probably. A Lynel could work as well.
-Pikachu. Uh, yeah. Nuff said why. Unless I missed it. Could take the Motorcycle approach and would be an obvious lightweight. It could have its various costumes like Libre as is.
-Black Mage. Another simple one from Final Fantasy. You could use Vivi otherwise, depending on what you prefer.
-Boshi. A very easy choice as is.
-Geno. Honestly, I want to see him in and he fits the atmosphere well.
-Ridley. If only cause I want to see that crazy lanky guy fit himself into a Kart. Better than the Beach Volleyball Parody. ._.
-Bayonetta. Very easy option and honestly would be funny to see in a Kart.
-Captain Toadette(if I didn't miss her already). Just a middleweight clone for Toadette, or basically a female Captain Toad, heh.
-Practically any other Smash character, using the first character in the series, of course. They'd just be silly options otherwise.
Thankfully you had Pauline already. That reminds me, I should actually finish up a Joke idea I had for a Quest Kart. >.>