My Roommate is an habitual person:

An'na has a habit of forgetting the refrigerator door or cupboards cracked open. An'na has a habit of 'borrowing' Ludwig's pain pills when he's not around. An'na has a habit of eating only bagels and ice cream as if those were the only two foods that exist. An'na has a habit of sleeping on the sofa when (as Ludwig found out later) her bed just seemed to far away. An'na has a habit of avoiding talking about her family in a way that doesn't make it seem like she's ashamed of them. An'na has a habit of watching movies more than he reads books. An'n has a habit of listening to music when she cooks. An'na has a habit of making the "Kitchen Cleaning Rotation' chart disappear when it's her turn to clean it. An'na has a habit of strategically talking her way out of situations. An'na has a habit of eating Christmas cookies first thing in the morning. Ludwig has a habit of sometimes overlooking these things because he realized his roommate is just an habitual person.