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1.
The main character (or protagonist) from the Persona series on games. A portmanteau of Bro and Protagonist.

Most fans and the creator of the series have called the player's character "Brotagonist"
--What should the Brotagonist do today in persona 4?

--I don't know, dude, all the options are boring.
by Perusa July 11, 2009
 
2.
The main male subject of a story.

Useful for describing white trash "bros" or black "bros" (short form of brothers) in a situation. Very good for watching movies.
c: Man, he just drove into a train!
d: What? How did he do that? I just went to the washroom for a minute!
c: Well, the brotagonist was driving right beside him on a motorcycle, and he managed to hit a jump, avoiding the train. The other jerk went into the side of the boxcar.
d: Dude. No joke!

a: Did you hear the latest R Kelly track?
b: No, dude I did not. Is it good?
a: Sort of. In it, the brotagonist is talking about making a sexual video with a young girl. It hit a little close to home.
b: No joke.
by Silent Erik December 25, 2008
 
3.
Your main bro/best friend
You're like the brotagonist of my life, man. Like, if my life was a book... then yea.
by K-Town McPawesome March 18, 2008