Upvoter
An upvoter is someone who creates a YTMND account, focusing mainly on voting on every site. This is the opposite of a downvoter, and is treated in a similar way as downvoting in most situations. Often people choose to upvote simply because of the existance of downvoters, saying that as a result the vote is averaged out.
Among the most famous upvoters is The Upvoter [1], a ytmnd user who upvotes all sites, including those of his downvoting nemeses, such as adverb and inkdrinker. The Upvoter assumes a super hero persona, and presumably moonlights as a regular ytmnd user. He uses the Sesame Street song "twelve" as his theme song. He has since retired[2] but maintains a following in Upkateers.
Upkateers are a large group of upvoters who mimic TheUpvoter by Upvoting every site they find. Some users believe that the because of the large growth of the upvoters, their cause has become moot as they hold considerably more sway than the smaller downvoting community.