Quark, played by Armin Shimerman, is a beloved character known for his witty and often humorous interactions on the show. Some memorable moments involving Quark include his clever business deals, his complex relationship with his brother Rom and nephew Nog, his interactions with the Ferengi Rules of Acquisition, and his involvement in various schemes and adventures throughout the series. Quark's character provides a unique perspective on life aboard the space station and contributes to the overall charm of DS9.