poster child

a person, originally a child, or thing presented as a symbol or archetype as in advancing some cause

See poster child in American Heritage Dictionary 4

noun
  1. A child who appears on a poster as a member of a group benefitted by a charitable organization: a poster child for muscular distrophy.
  2. A person who is a prominent example or type of something: “He was a living poster child for the evil potential of inherited wealth” (Jim Harrison).
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