Deuteragonist

A Deuteragonist is considered as the second most important character in a story. They usually share a strong bond with the protagonist, normally as a family member or a loyal friend.

Comic Series
Carl Grimes is the Deuteragonist of the Comic Series.

TV Series
Shane Walsh is the Deuteragonist of the First Season.

Carl Grimes is the Deuteragonist of the TV Series.

Fear The Walking Dead
Travis Manawa is the Deuteragonist of Fear The Walking Dead

Video Game
Clementine is the Deuteragonist of the First Season.

Survival Instinct
Merle Dixon is the Deuteragonist of Survival Instinct.

Novel Series
Philip Blake is the Deuteragonist of the Novel Rise of the Governor.