I think there's some room to expand the term in areas that the original usage didn't explicitly address, but which still fit the overall idea.
Sure. And it certainly isn't only a fanfic thing - Diane Carey's 1986 Trek novel Dreadnought! has a main character (Cadet Piper, who manages to almost out-Kirk the Kobyashi Maru in the first scene of the book) that's pretty commonly seen as a Mary Sue.
(and honestly, I think an alternative term for male characters is redundant)
I noted "Marty Stu" largely to make it clear that Smith and Ferraro had already in the 1970s realized that similar issues cross gender bounds. Indeed, in initial drafts of the short story, Mary Sue had what would be traditionally considered a masculine name (they had considered Murray Sue and Marty Sue, for example).
Part of the reason to have a different word (at the time) was to highlight the fact that criticism at the time generally allowed and approved of male characters with inexplicable potency but insufficient characterization.
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