I think it would be cool to have ●●|●●●●●|●●|● in the game. It could walk by or just stand there. There would be like a 50% chance of saying something like: "What the hell are you" or "What is that thing." When the player says that, ●●|●●●●●|●●|● would attack the player. It would have a containment cell with some papers inside telling whoever was in there during the breach what to do. There would be some events where it would just speed through the walls, similar to SCP-106. What do you think?

The concept for this SCP is honestly insanely cool, but personally for the game there's way too many monster SCPs already implemented; this one would probably make things more overcrowded than it should be. But there could be an easter egg reference with like a torn infographic about it posted on one of the rooms, which is enough to prevent the player from being curious and deciding to know more about the object, which would have led to it being taken by said SCP (which is not implemented in-game in this case).