Tritagonist

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

Occurences

 * Lori Grimes was the tritagonist from Season 1 to Season 3.
 * Niall Ross became the tritagonist starting in "30 Days Without an Accident" until "What Comes After", where he become the deuteragonist following Rick's departure.
 * Jason Ross became the tritagonist starting in "Who Are You Now?" until "The Calm Before" where he becomes the deuteragonist following Niall's death.
 * Daryl Dixon became the tritagonist starting in "The Storm"..