A regular customer or patron who frequently visits a shop or establishment; someone well-known to the staff.
あの寿司屋の常客は店主と会話を楽しんでいる。
The regulars at that sushi restaurant enjoy chatting with the owner.
彼女はそのカフェの常客で、毎朝同じ席に座る。
She is a regular at that café and sits in the same seat every morning.
常客にはポイントカードよりも特別割引が用意されていることが多い。
Regular customers often receive special discounts rather than just a point card.