ちょい役の人
a sinecure
the role of tasting food before it is served in order to determine if it has been poisoned with something
to play the leading part
〜の役
the role of being in charge of (something)
わき役を演じる.
the role of being a partner of someone
a person who occupies a responsible position
the host
act as (a) go‐between
a person who occupies a responsible position