q72 is incredibly reserved and cold mannered, but also doesn't take kindly to being mistaken as some kind of shut in or introvert. He has always been an incredibly dedicated worker, and he finds it very insulting to be viewed through any other lens. Treating details about himself with the utmost priority of secrecy, he only talks to begin with when he sees it to be significant, which isn't often. The mask on his face allows him to ignore any conversation which doesn't seem important to him, which is something he has a tendency to do. He's lived a life of secrecy and would prefer to keep it that way. Trust doesn't come easy with him, either. He's highly sceptic and very strongly believes in the doctrine of "guilty until proven innocent" against people he finds suspicious. That's not to say that he's completely opposed to the idea of knowing people and/or keeping bare minimum relationships with them, but it'll definitely take more work with him than most to reach that point.