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A desirable username is one that a lot of people want obviously.
As far as my personal preference goes, I dislike usernames with numbers, special characters, excessive caps and lowercase (ex: I aM a NoOb), buzz words, anything that evolves drugs, mispellings, i's in place of L's or vice versa, tons of x's, i's, or L's, usernames ending in v.(random number telling us how many times you were banned) and usernames with words all jumbled together without spaces.
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