Since I'm not sure of the exact 'Giza Killer' true story, I can't say for certain the key elements. But if it's a murder - related story, key elements might include the identity of the killer, the victims, and the motives behind the killings.
The 'Giza Killer' isn't a widely known mainstream historical or criminal figure that I'm familiar with. It might be something from a very niche story, perhaps a local legend in Giza that involves a supposed 'killer' in a mystery or horror - themed narrative. Without more context, it's hard to provide detailed information.
I'd say no. There's no widespread knowledge or evidence suggesting that 'Killer Soup' is a real story. It could just be a creative idea or part of a fictional tale.
Jeff the Killer is purely fictional. It was created and spread through various online platforms and has no basis in real events. People just came up with the creepy tale for entertainment or to scare others.