Habit A habit is slightly different. Kathy may have a habit of getting to work late because she cannot plan ahead what she is going to wear. Every day, she promises that tonight she will lay out her clothes for the next day. But she doesn't. She has developed a habit.
Some people have expressions they use frequently.
These can reveal character. You can see a difference in how you might perceive Kathy, depending on which expression she tended to use a lot. Contrasting characters Strengthen the perception of your character's personality by having a contrasting personality type. Kathy may be quite quiet. Perhaps she goes to the lunch room after she arranges the flowers and a noisy secretary is sitting there drinking coffee.