Synonyms for Trouper:

n.

clown, comic, comedian, cast, artiste, act, acrobat, comedienne, conjurer, artist. mainstay, a man/woman of his/her word, crutch, anchor, a tower of strength, straight shooter, confidant, lifeline, right-hand man. actor (noun)
comedian, clown, artist, barnstormer.
mimic (noun)
playactor.
performer (noun)
acrobat, artiste.
trouper (noun)
barnstormer, playactor.

Other synonyms:

straight shooter, lifeline, confidant, crutch, right-hand man, mainstay. anchor. Other relevant words:
crutch, confidant, anchor, artiste.