Re: Who were the main characters?
Instead, as the movies progressed, it was the new characters that got written out and the old guard that kept coming back. Presumably because the audience wanted to see the familiar characters and so nostalgia won out.
Of course, that trend really began with The Motion Picture,
in which no less than three potential replacement characters were killed off or went missing!
“A life is like a garden. Perfect moments can be had, but not preserved, except in memory. LLAP” — Leonard Nimoy (1931-2015)