Baby Luigi said:Yes, that's very apparent that this happens with new models, even for similar characters, because you're better off modeling new characters with different facial features, build, and hair from scratch than editing them (you will mess up UVs if you rely only on texture edits and vertex edits to get what you want). Even characters like Baby Luigi have unique UV maps. I just said that "She even looks like her head was Frakenstein'ed onto Peach's body.", which means that part of the post wasn't meant to be taken literally.
She's still a low-effort character to make, however. Modelers make tons of models per week, and modeling a character with a similar physique to another character won't take more than a day to fully get down if you're a professional. The animations take the most time to make because you practically need to keyframe a bunch of animations and as you said, Peach already has. And practically all of her moveset properties are from Peach, meaning they pretty much don't need to tweak anything if at all when it comes to bug and balance testing, which is another time-consuming part of the character process.
In addition, particle effect animations aren't all that hard to tweak.
Chrom has his old Final Smash model and Dark Pit/Ken have their existing character models tweaked. Also, I doubt that making models would be easy if they need to be of professional quality (the dresses in Ultimate have some weird clipping bugs). Even Bowser Jr almost didnt make it because of the time to model the Koopalings.
Dont Daisy and Peach have almost the same UVs in Mario Kart 8?