Nopa has become a well-established part of San Francisco's scene. A key aspect of its enduring presence is the loyalty of its regular customers. One such regular is George McCalman, who has been visiting the restaurant for 20 years.

He is often found sitting at the bar, where he engages in his hobby of sketching. His subjects include the restaurant itself and the people around him. Further information about Nopa's history and its regulars can be found in a feature by The San Francisco Standard, which explores how the restaurant has become an institution in the city.