Thread:Kiacopia/@comment-27069645-20191222211414

Protagonist 1 a (1): the principal character in a literary work (such as a drama or story)
 * (2): the leading actor or principal character in a television show, movie, book, etc.
 * b: an active participant in an event

2: a leader, proponent, or supporter of a cause : CHAMPION

Notice how there isn't a definition for protagonists. That's because there isn't a definition. There are no multiple protagonists because that defies the meaning of the word. Above all else, Finn is without a doubt the protagonist of the show and Jake unambiguously the deuteragonist. While it is true that both Finn and Jake are one of the main characters, that's not what protagonist means. I would agree with your edits if any other character had any where near the amount of appearances and major roles that both Finn and Jake do and have. 