ID #5 was an unknown user. Similar to ID #4, he/she was banned for having the username "boobs". Just like ID #4, ID #5 had the classic noob skin, having a blue torso with yellow arms and green legs.
ID #5 must have been banned for that username, as he/she is no longer accessible on the main site. If you do www.roblox.com/user/5/profile, it shows Builderman with the '404 page cannot be found', therefor showing that the user has been terminated.