Tuor.
His story, while full of trials, tribulations, and hardships, nonetheless seems to end a more-or-less happy one. He and Idril seem to be granted eternal life together...
Besides which, as Gelmir and Arminas noted to Turin in Nargothrond, he was a genuinely nice guy, which you can see for yourself in his "Coming to Gondolin" and his portrayal in the original "Fall of Gondolin".
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I prefer history, true or feigned.
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