Xakk along with his two friends Tyler and Gavin starts the 5zer02 youtube channel originally to show Louisville from the point of view of locals. It is stated that Xakk lives over the Indiana border but has spent signficant amounts of time in Louisville. He has numerous piercings and dark hair and seems to enjoy their project very much. He is the first to speak up about the strange happenings surrounding the boys and their videos.
Not long after resolving to confront his friends about these issues, he goes missing. Through text messages he communicates with Amy and Tyler but otherwise spends most of the early part of the whole debaucle making appearances only in videos that mysteriously appear on the channel. He later is briefly encountered by Amy while she and TJ are in Indiana only to apparently slip away again.
On the 5zer02 youtube channel, he has been on video since the beginning. But on the TJAProjects channel, his first on screen appearance was in the video More Questions, No Answers which chronicled the accidental and geographically puzzling meeting of TJ and Amy with Tyler and Gavin. (Geographically puzzling because Tyler took off driving south and the boys found themselves meeting up with TJ and Amy, quite suddenly heading North.)
When we first spot him in More Questions, No Answers he is covered in bandages and seems to have trouble breathing. He delivers Amy a warning: Slenderman is watching. He lists the names of people being watched and this list includes the cast of almost every major series in existence, including the whole of EverymanHYBRID cast, save, noitceably, Damsel. (It's worth noting he does not mention Jay from Marble Hornets but does mention an 'Alex.' Seeing as how there are Alexs everywhere and the name was mentioned in the same breath as 'Jeff' it's unlikely he means the Marble Hornets character.)
On the 5zer02 channel, he is first shown in the introduction video, Introductions for all you Lucky Folks!.