Donald "Don" Danbury aka The Double D aka Dickhead aka "Oscar Lionetti" (Dan Clark) - (2007-2011) - Don is the protagonist.
Abby Jones (Sinéad Moynihan) - (2008, 2011) - Abby used to go to the same secondary school as Don, and stayed with Don in his house after applying for a room to rent, but is away travelling during the second and third series.