Leonard Nimoy: Fans Describe What Made Spock Such a Memorable Character

PHOTO: Leonard Nimoy as Mr. Spock in "Star Trek: The Original Series" episode Amok Time which originally aired, Sept. 15, 1967. PlayCBS /Landov
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As news of actor Leonard Nimoy's death spread today, fans mourned the loss of the "Star Trek" star.

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Nimoy, who starred as the emotionless half-human, half-Vulcan in the TV show and several films, died at the age of 83, but to Trekkies, his memory will live on.

"R.I.P Mr. Nimoy," wrote a "World News Tonight" fan on Twitter. "You will forever be remembered."

ABC News asked readers what made Nimoy's Spock such a beloved, iconic character and to share their favorite memories.

From his appearance to his demeanor, here's what they said.