Just John was the leader of the Squatters, he is known as tough and is very unbalanced and not very intelligent. He wears only shorts and is described as ugly with missing teeth and a shaved head with patterns in his short hair. He carries a lethal three bladed spear, the blades being made out of knives. He is vicious and unpredictable and hates the Palace Kids and all other organised and ordered kids. He was an exceptionally talented close-range fighter, easily able to overpower Achilleus during their fight. But he is also extremely arrogant and made the mistake of continuously taunting Achilleus during the course of the fight, to the point of incredibly overconfidence. He is also homophobic and taunted Achilleus with the idea that he was gay. After he was defeated by Achilleus, Achilleus kisses him full on the lips to embarrass John. Achilleus chooses not to kill him in the battle to death so John surrenders to the Palace Kids so they could expand their crops in St. James's park.
He is embarrassed by the fight with Achilleus and seeks revenge on him. Soon after the end of The Enemy, he makes an uneasy alliance with David since he is out for revenge also. This is why they are working together in The End.
In The Fear, he sees Shadowman in his camp and offers a beer to him. However, when Shadowman lets his guard down, John threatens him with a knife to the throat, stating that he doesn't like what Shadowman is up to. With his point made, John walks off laughing and drinking another beer.
In The End, he fights alongside David, Jester, and the Palace guards. Once they all however, he invades the palace grounds, kills Pod and then raids the palace before being killed by Franny with a pitchfork to the chest.