In the Half-Life 2 mod: "Grey," Bieber is an ugly baby doll demon that pounces and attacks PewDiePie. When Pewdie hits them, they fall apart and make the Mario "Dry Bones" noises. The actual Justin Bieber appears in Pewdie's video response to trolls named "BARRELS!." In it, Justin possesses Pewdiepie's soul after he unsubscribes to his own channel and forces him to watch his "Baby" music video. 

Pewdiepie also calls one kind of the black mud monsters with baby faces in "Alice: Madness Returns" for Justin Bieber, and the mega multifaced ones for One Direction. Weirdly enough - not -, noone gets upset when he calls them JB, but a lot when he starts calling monsters for 1D...

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