From The TV IV
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Simon is the son of Killface. He is an emotionally unstable, gangsta-rap listening, overweight, blonde-haired child version of Killface that mumbles everything he says. If listened to closely, he seems to mumble the same incoherent lines such as, "When I was only seven." He enjoys eating Kap'n Krump brand cereal endorsed by his favorite rapper Taqu'il (although he often ends up smashing the bowl on the floor). It seems that he also one day wishes to purchase a hermit crab, but will not get it, since Killface says that he's becoming too much of a liability.
He is sensitive about his weight. Simon does not seem to be very bright, as Killface scolds him for receiving a 'C-' in Algebra. Although he often appears to be in rebellion against his father, mostly by pushing his bowl of cereal on the floor, Simon does appear to seek Killface's approval. In the episode 'Kidnapped,' Simon manages to capture Xander and Stan entirely on his own, even though Killface had excluded him from the operation due to Simon's poor grades, which may imply he's actually smarter than his grades suggest. Simon also seems to enjoy mocking others, as he picked on Phil in the car ride to Las Vegas after Phil is beaten (off-screen) by Killface for asking too many questions. Simon's misbehavior and general poor attitude may be due to the fact that he wishes to go back to Arizona, where it is implied he and Killface had previously lived. Killface insists that they can't ever go back there due to Simon's sociopathic tendencies.
When Simon steals Xander's robot pants and takes all the knives in the house, Killface proclaims "It's Arizona all over again!" and tells Sinn to call all the pet stores in town. Simon is also seen purchasing a cage full of rabbits while wearing a bandolier of knives. The store owner remarks upon the fact that Simon is not buying any food for the animals. It is revealed that Simon appears to be the boss of a rabbit-fighting ring in Chinatown; because of this, Simon is kidnapped by a rival, but after a fight between Crews and Killface, the boss lets them all go.
In the finale, Simon presses the launch button that causes the activation of the Annihilatrix, after laughing like his Second Father figure, Torpedo Vegas, and muttering the word 'Boosh', a word used often by the Xtacles.
When he pushes his cereal bowl on the floor.