upstager

(noun) a selfish actor who upstages the other actors.

(adj) of the back half of a stage. Synonyms: upstage (vs. downstage). Example: "She crossed to the upstage chair forcing the lead to turn his back to the audience."

(adj) remote in manner. Synonyms: aloof, distant, upstage. Examples: "Stood apart with aloof dignity." "A distant smile." "He was upstage with strangers."