Some of them are pretty good, mostly the comic book characters. Some of them are okay and some have things that just don't make sense. Why does Peach have a bazooka? The Mario world has Fire Flowers and shit. At least stylize it as a Bullet Bill launcher or something. It would have been fine if not for the out of place bazooka.

Also at least one is stupid.

That one is the Zero Suit redesign. I can maybe understand why some people might dislike the Zero Suit because it's form-fitting and maybe that makes them uncomfortable, but it's also completely functional for what it's supposed to be and appropriate. If she's going into combat she wears her Power Suit, so adding all that combat functionality to her "Zero Suit" isn't helpful because she has a much better option. On the contrary, if that were her Zero Suit it would actually be a hindrance because the Zero Suit is an athletic body suit she wears underneath her Power Suit. All those pads and superfluous bits would make it difficult and extremely uncomfortable to use the Power Suit at best.

Sensible redesigns of the Zero Suit would have to keep in mind the actual purpose and functionality of the damn thing. Personally I think the only thing that really need to be change about it are the silly high heels it has in Other M and SSB4 (although at least in SSB4 they're stylized as rocket boosters, but as far as I know heels aren't easy to be athletic in so it's still a bit silly).

Also to remind people, the Zero Suit is actually a lot less revealing than what Samus use to wear before Zero Mission. It use to be bikinis and midriff-bearing halter tops and such. Stuff that still kind of made sense (after all, these are things many real women actually wear for athletic activity), but the Zero Suit is very much exactly what you should expect it to be as her undersuit... suit.