I went for Elrond as he has seen Middle-earth through about half its history and knew that from before. I had thought about Gandalf, but as he had only been there for only a couple thousand years and the rest of it was also second hand, I decided against him; besides, what went on earlier in Valinor was probably quite boring after the second week.
I thought about including the less than major characters in the poll, but it grew too large IMHO. Still maybe we could later have a poll that just included Galadriel and Celeborn, Boromir, Faramir, Denethor, Theoden, Eowyn, Eomer, as well as Merry, Pippin, and Sam, not to mention Barliman Butterbur, Bill Ferny, Grima Wormtongue, Saruman, and a gaggle of named Dwarves and Elves. Who to put in and who to leave out? Oh the humanity of it all!
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