stock character 

Some one you have on your contact list only for the sake of having one more person show up to a party, or other gathering; Someone who contributes nothing more than sheer quantity to the party. They are usually dependable and never miss a party.

Rachel is a stock character for everything, she hasn't missed a party for years!

stock character by Fishy May 5, 2003

Minority Stock Character 

They always get killed.

Obviously he's going to die, he's a minority stock character.

Minority Stock Character by C. Widmore August 5, 2010