That's not really true. It's not a novel or a film - on a TV show, usually it's only a few main (and most important) characteristics of a character are set before the show starts. TV shows usually develop organically, without an awful lot being planned in advance, or, at best, some major elements of the story are planned in advance, and usually it's one or two seasons ahead. A lot of info and background gets added later, and there are many examples when the casting and the performance of the actor - as well as chemistry with the other cast members - influence the further storylines, portrayal and info about the background of the character. Especially when it's a recurring character. Sisko wouldn't have been black and wouldn't have the Benny Russell storyline if Avery Brooks hadn't been cast, Bashir would have been "Dr Amoros" if Siddig hadn't been cast, Odo (originally envisioned as a "Clint Eastwood" character) became a lot more emotional and in love with Kira because of Rene Auberjonois's performances, Dukat wasn't supposed to be a particularly layered character and might not have gotten such a big role in later seasons if it wasn't for Marc Alaimo's portrayal and charisma, and to my knowledge, if it wasn't for his chemistry with Nana Visitor there would have been no special Kira/Dukat dynamic (apparently an idea dates about the time of "The Maquis"), and so on. Do you think that Picard would have loved Shakespeare and Earl Gray tea if Mitch Ryan, Patrick Bauchau or Yaphet Kotto had been cast instead of Patrick Stewart? Was being straight ever a part of Garak's backstory in the character bible? I really, really doubt it. And there are lots and lots of examples of TV shows that expanded the roles of recurring characters and made them into regular and wrote major storylines around them as a result of the actor's performance and popularity; and examples of TV shows that had major, crucial relationship storylines being written into the show, even though nobody had planned it initially, because actors/characters turned out to have an amazing chemistry, and the "subtext" got noticed by fans (and lots of shipping ensued), long before it became "the main text" i.e. the relationship became canon.
I'm not talking about later modifications to a series based on those things, which I'm quite aware of.
As I stated in the post you quoted:
"They will usually modify a character based on the performance the actor gives, if they like it"
Which covers many of the examples you provided above..... but by your own words above, in the end, it's the writers/creators of the show who have the final say.... not the actor.
I never said they had the entire series written out before they even started the first episode, but they do have the basic elements of those characters drawn out at the start which they expect the actor to play out as they envisioned, otherwise they wouldn't have gotten the part..... or they did the part differently but in a way they like, thus at that time they will modify the character and other story elements..... but it's still the final decision of the creators/writers what actually happens.
If the actor does something they don't like or doesn't portray the character as they think they should, they call a cut, tell them to do it again and their previous performance is scrapped.
Back on track a bit towards Garak, my wife and I watched the first episode he appeared in last night and neither of us could find anything that would suggest he was gay, in his movements, facial expressions, gestures, or what he said...... and when he put his hands on Bashir's shoulders, he just seemed like the creepy "I may kill you tonight" Garak that we remembered.
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