Mannerisms and Habits

What makes you, you? Often times people have habits unique to them. Sure, they shower and brush their teeth, but does your character always put his mug in the same place? Does she always cuff her pants? What little things/actions belong to them and them only? Figuring out what makes that character unique - like habits, twitches, tics, random sayings - can make that character both more likable and more relatable