Prantagonist

A character of a story who is the protagonist who, through a series of plot twists, ends up to also be the antagonist

a combination of protagonist and antagonist

Alex Mercer from Prototype could be considered an prantagonist

Prantagonist by AfroNinja117 October 12, 2009

Protantagonist 

When the protagonist of a movie instead of embracing the role of the heroic figure that struggles to defeat evil, turns to be the antagonist of the story as well.

Ray Kroc is a Protantagonist in Power Hungry.

Protantagonist by RoberFreeloader July 22, 2017

Prantagonist

When the main characters are both good, but oppose each other.

IN Batman v.s Superman, they were both prantagonists.

Prantagonist by Arkival September 6, 2019