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Goku is the main character from the Dragon Ball anime and manga series.
Goku has spiked, black hair and wears an orange ki suit.
A false version of him created with Axol's Inkweaver has him powered up into his Super Saiyan form.
He appears near the start of the video where Shaggy slaps him, just for both of them to be run over by Mario doing his backwards running challenge.
Later on in Fishy Boopkins' challenge, he appears with his hands raised due to Shaggy aiming a gun at him. Boopkins naturally runs away due to needing to avoid anime for one hour.
Both of these appearances serve as a reference to the "Ultra Instinct Shaggy" meme.
Although he does not appear in the video himself, one of the challenges involves replicating his scream, with Bob being the best.
Another false version of Goku appears in The Anime Arc's finale as the most powerful creation of Francis in the Battle of Anime Island. To demonstrate how powerful he was, he easily defeats most of SMG4's Gang and allies (even blocking Luigi's Green Missile Attack).
Knowing they cannot win in a straight-out fight, Saiko Bichitaru told Tari to delay him, which she did by having a round of Dragon Ball FighterZ. It worked but it wasn't enough until another stalling happened, allowing Axol to create Shaggy Rogers to combat Goku.
Eventually, Goku lost the fight to Shaggy Rogers, causing him to start self-destructing in the bid to take Shaggy out with him. He eventually does explode. However, his intended targets dodged the explosion due to Shaggy's high speed, instead, taking out the Anime Cartel and what's left of Francis.