Born in Novigrad, he grew up in a working class neighbourhood. After his father died of cancer when Kristof was young, he was raised by his mother alone.
In his childhood he did not have many friends, and those he had never stuck with him for too long. Whenever he felt lonely at home with his mother at work and no friends, Kristof would always go visit his grandfather that was living in a cottage outside of Novigrad. Spending a big portion of his time there, he developed fondness to fishing which his grandfather taught him about.
After graduating from high school Kristof started working in a warehouse that was storing items ranging from food through clothing and up to also some of the more expensive materials and items.
Throughout the few years of working there Kristof did not really move anywhere in his work position, still the same worker as when he started just with slightly higher monthly pay. Which was pretty low either way, yet Kristof not caring about it would most of the time drink away big part of his salary coming home drunk making his loud and angry scenes that usually woke up "half the apartment building" he was living in.
Opposite to his childhood, Kristof now in his adult years found some way to people, making couple of friends up and down the place, some from work but most from sitting around the bars and spending time in the nightlife of Novigrad. Some of them were really nice people...but the others? ...drunks, junkies, you name it...most of them were violent assholes and spending time with them affected Kristof to some extent. He got himself involved often in fights with people around the bars, clubs or just anywhere in the town with anyone, even his own friends. Friends or not, he never really cared about who he hurt in any way. The fights caused him issues with the police that lead to him getting arrested couple of times.
Later down the road the outbreak came by, it just happend with a snap of a fingers. In the time of all people eating happening around the place, Kristof was going by alone at first but at later date he got himself involved with a group in Novigrad which was lead by Bogdan, Runners people used to call them. It took him some time but he managed to make his way in and find his place within the group.