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PewDiePie (real name: Felix Arvid Ulf Kjellberg) (born: October 24, 1989) is a gamer and one of the most subscribed YouTubers. His channel is currently the second most-subscribed after Indian company T-Series.
In SMG4's videos, he appears in SM64: ṩṩἔᾗмὄḋᾗᾄʀ 0 - Release the Retardness! making a cameo appearance on the bottom left of the screen when Mario is hovering over Luigi. He also briefly appears dancing in extremely blurry resolution in SMG4: The Melancholy of Fishy Boopkins among the "cancerous" memes that attack Bowser and make the whole place go "deep-fried."