unwelcome person

persona non grata

individual mortal person somebody someone soul

annoyer bad hat disagreeable person disreputable person gloomy Gus ingrate interloper intruder killjoy meddler mischief-maker party pooper picklepuss pouter scoundrel sourpuss spoilsport tease teaser thankless wretch trespasser trouble maker troublemaker troubler undesirable ungrateful person unpleasant person vexer villain wet blanket