Tritagonist
Third most important character of a narrative / From Wikipedia, the free encyclopedia
In literature, the tritagonist (from Ancient Greek τριταγωνιστής (tritagōnistḗs) 'third actor') or tertiary main character is the third most important character of a narrative, after the protagonist and deuteragonist. In ancient Greek drama, the tritagonist was the third member of the acting troupe.
As a character, a tritagonist may act as the instigator or cause of the sufferings of the protagonist. Despite being the least sympathetic character of the drama, they occasion the situations by which pity and sympathy for the protagonist are excited.[1]: 451