The term "poster boy" refers to an individual who represents or embodies a particular idea or movement. Some synonyms for this term include "standard-bearer," "flag-bearer," "icon," "embodiment," or "representative." These words are used to describe someone who is seen as the perfect example or model for a group or cause. "Poster child," "exemplar," and "paragon" are additional synonyms that can be used in place of "poster boy." These words are often used in a positive or neutral context, highlighting a person's leadership qualities, expertise, or commitment to a specific cause.