Habitue (noun)

1. A person who regularly frequents a particular place, such as a restaurant or a theater.
2. A person who has a habitual or regular practice of doing something.

Origin:

From french 'habitué' meaning a habitual visitor or customer, from 'habituer' meaning to accustom or habituate, from 'habitude' meaning habit or custom.

Examples:

1. The bar had a group of regular habitues who came in every evening after work.
2. The theater was filled with its usual habitues for the opening night of the new production.
3. The coffee shop's habitues included writers, artists, and musicians who came to work and socialize.
4. The gym was busy with its habitues, who stuck to their exercise routines rain or shine.
5. The scholar was a habitue of the library, spending most of his days there studying and researching.