His real name is Martin Croiss. He’s an agent for the Chaos Insurgency, which is a foundation with the goal of breaching the SCP Foundation’s data and even releasing the entities that the foundation contains, including lethal SCPS. Often they are unsuccessful as the security at the SCP Foundation is top tier. While they often aren’t able to breach any data or entities, the majority of the agents always manage to get away and make it back to the Chaos Insurgency Base.