a haphazard idea could be...it depends on how much mutagen you are exposed to? And also perhaps how long? Really no way to prove this, all I know is with Karai being the prime example, mutagen can be tailor made with specific specifications on how it will mutate someone.
Though just as a visual preference, Xever would have turned into a "fish man" like a Zora from Legend of Zelda or the "deep ones" from cthulhu myth. Basically he'd have had legs.
But then they would have needed another narrative way to introduce the Krang technology to Shredder...so...eh.
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