Of course they have the right to change Samus' appearance as much as they'd like and they have several times. I don't think anyone really would argue they don't have the right to do that. However, the flip side also is that someone does also have the right to criticize a shift in direction or not be involved in a product if what the artist does offends them on some level. It doesn't mean the owner of the character is required to change their character or that the artist is wrong for their opinion. Wouldn't be any different for me if someone criticized my OC in my avatar and it doesn't change anything for Samus either.
This kind of thing happens all the time especially with characters that change and evolve over time, people are going to get attached to a version of a character and will have issues with drastic changes to a character appearance, story, etc. It's just kind of the way people work, especially with fiction where character can stay the same or be randomly changed at the whim of the artist in question.
I'm well aware of my issues with the design or how things have played out with the characters are strictly developed of my own opinion and observations and not much else, same as pretty much everyone who's commented on it.
There's a difference between disagreeing with an artistic design choice for legitimate reasons like, for instance, a character looking really cartoony in a hyper-realistic world (meaning a clash in aesthetics is present), getting offended by some genuinely offensive design or the reason for said design (an innocent, 13 year old female character being forced to wear something with extreme sexual connotations), and then just being a prude. Saying that ZSS's official designs are offensive is just being prude. Saying her portrayal in Other M was sexist in terms of writing would be valid criticism, but her design was fine.
I'm all for freedom of speech and all that gay stuff (latter part is just a South Park reference, before anyone takes that the wrong way), but using that freedom of speech to make completely non-productive criticisms is just inviting people to get annoyed with you.
I can guarantee you these women can't twist their bodies like that in order to bring attention to the breasts and buttocks. This has nothing to do with her character portrayal it's fine she's a badass bounty hunter and Other M gave her a bit more emotional depth. The problem is the fact that she's being twisted and warped to give her secondary sex characteristics as much screen time as possible. I told myself I wouldn't argue about this anymore so just read the link i added before.
(FYI, I did read the link and it's partly what's encouraging me to say what I am)
How do you know how flexible every woman on the planet is?
Samus is supposed to be flexible to a super-human degree due to being raised and intensively trained by the Chozo. Again, I refer you to that Morph Ball picture I posted earlier. So with that considered, the poses you claim are impossible for real women are a cinch for Samus, regardless.
And saying the poses are done to bring attention to the breasts and buttocks is just making assumptions and is quite frankly, you doing the sexualising, since you cannot prove that Sakurai intends that with every ZSS picture (and since screenshots are in game, you would also be claiming that ZSS's attack animations are made for sex appeal).
I also already explained that Samus' over-the-top poses are like that as they are taken mid-animation, and a certain animation technique is being used that I cannot remember the name of (it's related to the principle of animation called "arcs", but it's not that alone). A lot of characters look off model when you pause mid-animation because of the various, cartoony animation tricks being used. This is something you should know about if you've paused playback of pretty much any cartoon ever. Heck, there are people who dedicate time to finding these sort of things.
For a Smash 4 example that isn't ZSS, say hello to yaoi hand Mario:
