M'ress is a lovely, tabby-colored Caitian with a sweet, purring voice. A Communications officer, she has become Uhura's right paw (so to speak) in maintaining the Communications "grapevine."

M'ress has a pert vivaciousness which, because of her relatively deep voice, is often mistaken for seductiveness. In that department, however, she is very discreet. In fact, she has only been known to have an intimate relationship with two crewmembers; Sulu (did anyone doubt that?) and her fellow Caitian, Mrraal (see Mrraal).