What is gender-neutral equivalent of poster boy/poster girl?

What is the gender-neutral equivalent of poster boy/poster girl?

I want to use it in the context of a company, which is neither he nor she, like in: "a poster boy/poster girl company for self-organization."

Also, is either of the forms "poster boy" or "posterboy" more correct?

Solution 1:

The term is poster child (written as 2 words):

A person or thing that epitomizes or represents a specified quality, cause, etc.

‘the antiglobalization movement's poster child’

All signs (eg COCA) point to it being used much more often than poster boy and poster girl.

Solution 2:

A simple answer could be poster person.