Bill

 The Supercat Video Universe: Volume 1 

Bill was a hit-man who was hired by Jamie in The Supercat Video Universe after his plan didn't work out and it created two more versions of Callum.

Bill was sent after Meme Man first and as he heard that Meme Man was looking for a gun he decided to pose as a Gun Dealer.

Bill ended up giving Meme Man a gun for free but he told Meme Man that he had to do work for him in return.

Bill staged a plan that involved Jamie posing as a target that he wanted Meme Man to take out but in the end Bill tricked Meme Man into thinking he was going to kill the disguised Jamie and Meme Man handed over his gun and Bill killed him with it.

He also murders Harry during the Video Universe and ends up losing a death battle with Callum in the finale but is brought back to life along with Jamie and Harry via the 'Time Reset'.

Bill had a persona that went by the name "Knuckles" that was created in order to help find one of the personas Callum had who was dressed like Sonic The Hedgehog. Bill and Knuckles both suffered side effects from the magic which made both of them have blond hair.

After the 'Time Reset' Bill is asked by Jamie whether he would consider quitting his job as a hit-man. Bill stated that he always wanted to be a hairdresser.

 The Supercat Video Universe: Volume 2 

At the start of the Supercat Video Universe: Volume 2, Bill contemplated whether he could quit his hit-man job to become a hairdresser. After some thinking he decides to quit being a hit-man, he throws his beanie into a river and then he disposes of his guns off-screen.

The fact that Bill had quit his hit-man job made him overly excited. This excitement however was soon to be over when a bright flash occurs and a grey hoodie (which appeared to be JJ's hoodie from Captain Callum Adventures) fell into his hands which left Bill confused about where it came from. Bill wandered for a while until he came across the source of the flash, a magical stone (the same one that Mullac had and then it teleported into Captain Callum's dimension).

Bill then recieved a phone call from Jamie and was seen running off in a hurry. He also dumped the grey hoodie as he ran off.

On his way to meet Jamie he runs into Mullac (literally) and he drops the stone but soon picks it back up. Mullac sees an oppourtunity to try and pursuade Bill to give it to him as Bill just thinks it's a regular rock.

Bill refuses to give up the stone and tries to flee but Mullac stops him in his tracks and tries to fight him. Mullac ends up losing to Bill but he then finds a gun and holds Bill at gunpoint. Callum appears and is shocked to find that Mullac now has a gun.

Bill and Callum come up with a plan to distract Mullac by giving him the stone and when he goes to pick it up they make their move to escape and also get the stone back. Bill and Callum leave Mullac on the beach and head out to meet Jamie but they find that he's now missing from the meeting place (The Underpass).

Callum and Bill split up to look for him but they don't find him. Bill begins to talk to Callum about how crazy his life is at the moment then suddenly Mullac appears from behind one of the pillars and shoots Bill through chest.

Bill tells Mullac to "Go to Hell, you tall ass twelve year old" before shortly passing away.