As 106, he is callous, sadistic, and has proven to hunt humans for pleasure, not for any form of sustenance. 106 plays with his prey, especially within his own dimension, before killing them as they lay a broken mess. His sadistic tendencies are also one of his weaknesses, as he cannot resist the allure of human suffering; especially by one whose femur was broken. SCP-106, known to the SCP Foundation as "The Old Man", is a humanoid entity that secretes an extremely corrosive material.