A main character in a book, movie, or Video Game who is known for being neutral, gray, or walking the line between good and evil; Could also be a character that has CHANGED sides or PRETENDED to change sides (Or in a video game, can change sides if the player wishes).
Pantagonist is a triple play on words, Pan meaning all and it also being a combination of Protagonist and Antagonist.
An antagonist is a character(s), institute, or concept that is used as a force of opposition towards the protagonist. Often, in most cases, the antagonist is a bad guy, a villain, however that isn't always the case. In some cases, the antagonist could very well be a good person, a hero.
Person 1: Those cops in those movies where they try to stop criminals are good antagonists.
Person 2: But they are good people. How are they antagonists?
Person 1: Antagonists aren't necessarily bad people. They just oppose the protagonists, in which some cases the protagonists is the evil one. Like Death note. Light Yagami may be the protagonist, but you know he's the evil one and L, the guy trying to stop him, despite him being the good guy, is the antagonist of the story.
Believing you and your life are either literally or metaphorically the center of a metaphysical narrative in which you are the protagonist and that your life obstacles or people you disagree with or dislike are forces of evil. Most often seen in people who have consumed large amounts of entertainment such as books, movies, or video games which have a concrete "good or bad" for most of their lives.
An immature, small-minded, pathetic creature that becomes a facebook "fan" of someone just so they can spew hateful rhetoric about them and insult the true fans.
The Hentai Protagonist Haircut (or hph for short) is that generic haircut dudes get looking like a damn bowl on their head. Literally the most boring possible haircut a dude could get.
Person 1: Hey did you see Dane's recent haircut?
Person 2: No, what does it look like?
Person 1: He's sporting a damn Hentai Protagonist Haircut