A typically generic person in a famous or notable organization, such as a sports team or political party who is destined to not stand out.
The sketchy notability requirements usually will qualify them for a low trafficked Wikipedia page.
John Smith is a Z grade congressmen from the 7th Wyoming Congressional District
Fatguy Runblock is a Z grade lineman of the Buffalo Bills.
Pintapout McJobber is a Z grade WWE dark match jobber.