That picture isn't really saying much. It's just some guy. Could some one add context?

Why was the Scrubs example changed? Turk and Elliot aren't the Deuteragonist and Tritagonist. Dr. Cox, especially in the first three seasons, is the character with the second-most development and conflict, a lot of it independent of his interactions with JD. One could make an argument for Turk as the Tritagonist, but it's iffy.

I have to say that I find the Final Fantasy X example here the one most fitting this trope. The game is about Tidus being transferred into a different world and his misadventures there - following his father, trying to find out what happened to him since he disappeared years ago. But, at the same time, the game is about the summoner Yuna, as she goes on her Pilgrimage in order to defeat Sin, the monster terrorizing her world. Both characters are central to their plots, both characters get a ton of screentime and whatnot. Tidus is the official Protagonist, he gets a variable name and Dissidia presence, but Yuna is just as important and the title of a Deuteragonist should, in my opinion, mean someone like that.

Is this the same as the Impact Character from Dramatica's theory? Or is it explicitly the type of character who's playing the protagonist to the B-plot, who may or may not be the Impact Character to the Protagonist?

A hell of a lot of these examples are just major characters, not protagonists of any stripe. Does ANYONE actually think that Lassiter is a protagonist on psych, for example?

I don't really agree with the Gurren Lagann example. Simon is pretty much unrivaled for the spot of main character, except by Kamina.

What the pronunciation of Deuteragonist?

Umm, should tritagonist have its own trope? Because it might work better to not have any examples of tritagonist on this trope.