User blog comment:Willbachbakal/The Co-Op System/@comment-175.139.62.248-20130907102326/@comment-1330314-20130909013651

A deuteragonist would be the second most important character in the story. Since Eleanor and Allison would already be deuteragonists in each other's stories, that would have to make Amir the tritagonist, a.k.a. the third character.