poster boy

noun

1. a person who appears on a poster
2. a person who typifies or represents a particular characteristic, cause, opinion, etc

   a poster girl for late motherhood

Example Sentences

Saracens have opened up with three comfortable wins to lead the early standings, with Tobias Elliott the poster boy in black.

From BBC

Joshua became the poster boy of British boxing after winning Olympic gold.

From BBC

The former poster boy of British boxing was left scrambling across the floor, desperately trying to get up, but unable to beat the count.

From BBC

Joshua came out of the Olympics as a heavyweight gold medallist and, rightly so, became the poster boy of British boxing.

From BBC

In becoming the first swimmer to win two individual golds in one night at the Olympics since 1976, the poster boy of these Games cemented himself as a global superstar of the sport.

From BBC