Paulmark18
Paulmark18 is a YouTube user who has made an introductory video as Daniel's friends Paul and Andrea.
Shortly after their mention in the video House Arrest, a Paul (along with an Andrea) turned up on YouTube. They posted a single video which spoofs the LG15 series. A recent YouTube message released by them said they would be making more videos.
In the first video, Paul explains the Baader-Meinhoff phenomenon, and chalks many of the coincidences of the lonelygirl15 video series to the phenomenon. The Baader-Meinhoff phenomenon is not a scientific theory, but an internet meme itself. The phenomenon is named from a discussion that developed on the St. Paul Pioneer Press message boards.
In the video, which is supposedly edited by Daniel, Paul is excited about the video, while Andrea reads magazines in boredom on the bed (a spoof of Bree's video The Danielbeast where Daniel is the one reading a magazine on the bed and ignoring Bree). Paul also claims to have borrowed Purple Monkey for use in the video, and indeed a P. Monkey puppet does appear.
The Creators have said they are interested in incorporating fan videos into the storyline, so it is possible these characters will eventually be accepted as the actual Paul and Andrea but the story behind those who made this video remains to be seen.
