Character Notes
Karl Gibbs is a rando in the Scream universe. He’s an escaped mental patient who has zero connection to Sidney other than being obsessed with Stab. He appears earlier in the film in Sidney’s coffee shop, so we were already clued in he could come into play.
Their Ending Spoiler
Poor Karl is the first Ghostface to be killed. He’s run over by Gale Weathers’ van (with Gale driving). His murder is a shock in-movie as Ghostface is always someone related to Sidney. Maybe they were shocked, but he seems more like a contrived character than one who contributes anything. He’s there to throw you off.