What is a “Gunther”?

A "Gunther" refers to a fictional character, Franz Gunther, from the American sitcom "Friends". Gunther is the manager of the Central Perk coffee shop, where the friends gang frequently hangs out. He is portrayed by actor James Michael Tyler and appears in many episodes throughout the series. Gunther has a quiet, unassuming presence and is often seen silently observing the friends' conversations and antics.