User blog comment:BlueBarracudaMary/Protagonist, Deuteragonist, Tritagonist, Tetartagonist, Pentagonist, What Comes Next?/@comment-33286367-20200124014244/@comment-961279-20200128052236

"And RRabbit42, when I label the characters as deuteragonists, I mean that there are two equally-important main characters." / "Along with Tritagonists, Tetartagonists, Pentagonists, Hexagonists, Heptagonists, Octagonists and Nonagonists."

That's where this kind thing falls apart. Based on what you said for deuteragonist, your definition of a tritagonist would be there are three equally important characters. Then for The Peanuts Movie, you have "Lucy - The secondary antagonist-turned-tertiary tritagonist", which means she's among three equally-important characters, but because she's tertiary to them, she's actually not as important as them. The "tertiary" in front of "tritagonist" makes it contradictory.