In his 2012 intro on Fridays with PewDiePie we see a Amnesia styled-room where his worst-enemy MR face comes up and shows a sign to Friday.
Pewdiepie is referenced multiple times in an episode of South Park he even appears as himself in several scenes
His Wife, Marzia Bisgonin Kjellberg had a channel of her own, called Cutiepie, but was she later discontinued the channel due to the growing pressure of the lifestyle
Pewdie was gonna come up a better idea to a series called ''The Life of Felix'' until he got a nickname called ''PewDiePie'' and later changed the name to that, it went later a success then his title ''The Life of Felix'' that was literally gonna be about his life as a nerd, exact same thing as the next title but with him playing video games and doing vlogging.
He has two pugs called Edgar and Maya