His best friend, X, went missing a long time ago, always sad, doesn't talk much, often cries or stares off into space, not very good at assertiveness, REALLY likes mint choco ice cream for some reason, has tried for months to find X but to no avail, seems to always be cold, mostly just wanders the park with no apparent reason, his brother Two always worries about him and helps him search for X (Not an actual AU, just made to see what a depressed Four would be like) (Note: X is very young)