From Homestar Runner Wiki
1-Up is Homestar Runner's 20X6 counterpart. Everybody says Stinkoman's the guy, but 1-Up wants to be the guy too. Stinkoman wouldn't let him because he was just a kid, and maybe he will when 1-Up gets older. However, the description for Level 5 in Stinkoman 20X6 says that 1-Up proved that he's not just a kid in the previous level. Stinkoman has yet to acknowledge this.
1-Up is often squished by Pan Pan, usually to Stinkoman's great delight. His most notable accomplishment outside of Stinkoman 20X6 is that he found Homestar's "time box" in time capsule. 1-Up missed a challenge in Under Construction, which Stinkoman took care of, and Pan Pan, Stinkoman, and 1-Up all ate pudding because they deserved a break.
His name comes from the video game term for an extra life. The name wasn't officially revealed until Stinkoman 20X6 debuted, and has, so far, never been said outside the game. The description of Level 4 in the Stinkomanual calls him "1up the extra man"; therefore, it is possible that this is his full name.
1-Up's physical characteristics follow Strong Bad's Japanese Cartoon rules: invisible mouth when closed (ridiculously huge when opened), kind of a bean-shaped head, shinier, and robot boots. However, he lacks blue hair (although in Main Page 17, scrolling the mouse over "Store" results in giving 1-Up this trait). 1-Up is one of the few characters in the Homestar Runner universe who has a visible nose.
 Character Evolution
|First design of 1-Up||2003||japanese cartoon, Main Page 17, Under Construction; time capsule||N/A|
|Current Design||2008||Twenty THANXty Six||The shine on his boots are slightly different and more curvy. His shirt is slightly darker, and the shading on his head is slightly softer. His nose is more rounded. His outline is a bit thicker. His back is more rounded than in the previous design.|
 Quotes of the Week
|1-Up's Quotes of the Week|