K9unit13 (also known as K9) is a user who joined the LEGO Message Boards on October 14, 2010. He had the rank Old Timer, 9,917 posts, and 5 studs.
He often changed his avatar around once a week, and sometimes more. He said he did this to get attention. Toward the end of his account, K9 kept his avatar for a prolonged amount of time.
In the MLN Music and Bands forum, he was in two bands: Blackbrick and Brick-It!.
He posted a retirement in the Official Retirement Speech topic, stating that he had told many lies about himself, such as saying that he was 19 years old (he was really 11) and a firefighter in New York City because he wanted to look cool, and that he had to retire because he couldn't take it. He came back about 2 days later because people said he would still be cool anyway, and because many users forgave him.
Due to an accident that involved him deleting his account, he posted his official retirement speech on an account called BillyBob3909.
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It is unknown if he had a signature.
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