Can I write my protagonist to be schizophrenic and hallucinate the antagonist?

Difference Between Protagonist and Antagonist
Protagonist and Antagonist are two essential roles in any story. Though you may not be familiar with these two words, you must definitely know by now that every story has a main character or a hero and a main villain who always works against the main character. Protagonist and Antagonist are the two terms we use in literature to introduce these two essential characters. So, the main difference between protagonist and antagonist is that protagonist is the central character around whom the story is woven, and the antagonist is the opposing force of the protagonist.
Protagonist vs. Antagonist – How to Use Each Correctly
Protagonist starts with the letters pro. This can remind you of a pros and cons list, in which the pros are all positive. A protagonist in a story is usually the good person, or is trying to do something good. Alternatively, you can think of pro with its original meaning of for. On a pro / con list, the pros list reasons for something. A protagonist is fighting for something.
Thread: Can the Protagonist Be the Antagonist?
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Antagonist Examples
An antagonist does not have to be another person. In many stories, the protagonist has an inner conflict-he fights with himself and has to sort out his own feelings. In addition, an antagonist does not have to be a character at all. It can be a thing. For example, the protagonist may fight against nature-he might have to overcome the elements.
The Two Keys to Writing a Menacing Antagonist
These two things together make her terrifying. She kidnaps him. She breaks his bones. She drugs him. She nearly takes his life, all over a fictional character—which only makes sense if you consider her payoff and her conviction. (If you haven’t read Misery or seen the movie, I’d advise it, but only if you have a strong stomach. Side effects may include deciding to use a pen name and/or avoidance of all public appearances.)
Difference Between Protagonist and Antagonist
Protagonist is a word that is derived from Greek word meaning the chief actor or one who plays the first part. He is the one who gets caught in the vortex of struggle because of the antagonist in the play or the narrative. If you have seen Harry Potter movies, it is the character of Harry Potter that is the central character, and he happens to be the protagonist in these movies. Being a good guy most of the time, a protagonist gets all the sympathy of the audiences or the readers, but if he is anti-hero or a bad guy, the sympathy of the people does not lie with him. The audience is still kept interested with a gripping storyline and the antics of the protagonist. A protagonist is always a human being with a cause with which audiences can easily identify.
A protagonist is a very important tool to develop a story. There are different terms for a protagonist, such as hero, focal character, central character, and main character. Regardless of what title you give a protagonist, he or she remains the key ingredient in the development of the story, which is why the story revolves around him or her. More often than not the protagonist is fair and virtuous, and is always supporting the moral good. Further in the plot the protagonist may undergo some change, which will probably be the climax of the story.
2 Tips For Introducing Your Protagonist
Does your character have a hair color outside the norm (i.e. fake red, blue, rainbow, etc.)? Give us that. Does your character have an obvious chase of heterochromia (aka when one eye color is different from the other? Give us that, but don’t be too blatant about it (tip: have it come up in conversation, or have someone else bring it up by teasing the protagonist, or asking how that’s physically possible). Does your character have some sort of physical ailment or missing limb, well, then your readers are going to need to know that.
Protagonist v Antagonist
Similarly, what if you are a character-oriented writer who just wants to come up with some interesting people to consider writing a story about them.  In this case, you may or may not even have a plot idea in mind.  But if you do, you can look into each of these characters you have created and imagine how the plot might evolve if each one, in turn, were chosen as the protagonist.  How does the course of the story change?  Would be goal be a bit different or a lot different?  Who would the best choice of antagonist be for each of your characters, should he or she be selected as your protagonist?
Protagonist, antagonist
A protagonist is the main character in a drama. Technically, there can only be one protagonist in a drama, though writers often use the word in reference to two or more central characters. The antagonist is the main character’s chief opponent.