I don't think they would have Sauron masquerading as a character created by Tolkien since that would violate canon. The clueless writers might do anything. Elrond and Galadriel both played active roles in LOTR so they should be portrayed as heroes.
The characters featured on the 23 promotional posters have been identified except for the stranger and the dark gauntlet. The dark gauntlet poster was originally thought to be Sauron but it's possibly Adar. There isn't a poster for Annatar so that character may not even show up until the second season. Adar is another obvious contender for Sauron since he is the only outwardly evil character.
https://nerdist.com/article/amazon-the-lord-of-the-rings-series-reveals-first-look-characters-posters/
2 Mysterious characters: Stranger/Meteor Man, Adar/Sauron?
9 Established characters: Elendil, Pharazon, Isildur, ELROND, Gil-Galad, Durin, Miriel, GALADRIEL,
Celebrimbor
12 Original Characters: Poppy Proudfellow, Nori Brandyfoot, Largo Brandyfoot, Halbrand, Theo, Arandir,
Bronwyn, Kemen, Earien, Marigold Brandyfood, Saddoc Burrows, Disa
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