supernumerary

nouns

a person serving no apparent function
"reducing staff is difficult because our employees include no supernumeraries"
is a type of (narrower)
a human being
"there was too much for one person to do"
a minor actor in crowd scenes

adjectives

more than is needed, desired, or required
"trying to lose excess weight"; "found some extra change lying on the dresser"; "yet another book on heraldry might be thought redundant"; "skills made redundant by technological advance"; "sleeping in the spare room"; "supernumerary ornamentation"; "it was supererogatory of her to gloat"; "delete superfluous (or unnecessary) words"; "extra ribs as well as other supernumerary internal parts"; "surplus cheese distributed to the needy"