Justin is Carly's hater who appeared in iHate Carly.
When Justin was 11, his dream was to be on iCarly, so he submitted a video, but it was not shown on the web show. As a result, he held a grudge and created an account to post hateful comments about her new iCarly show, with the comments all ending with "Do better." He later meets up with Carly at Skybucks Coffee Bar, and instantly changed his mind about her. They go on a date, however, Carly is unaware that he is her hater, until he is in her apartment. She later gives him an opportunity to perform on iCarly, but is turned off by his rather odd talent.