grinner

Example:He was the only frowner at the party, looking impatient as the guests talked.

Definition:A person who frowns.

Example:She was always the gloomster in the office, her demeanor heavy and gloomy, even on a sunny day.

Definition:A person who seems gloomy or glum.

Example:It was no surprise that he found the whole event a bore, being a walking sourpuss who enjoyed complaining about everything.

Definition:A person who is perpetually scowling, seeming cross or miserable; a constant grump.