When someone thinks they are the main character of their life. Usually comes with a side of individuality complex, quirky style and a self centered point of view.
"I asked Jenny where the beer was and she said 'Just over the horizon, like my dreams.'"
"Yeah, that girl has a major case of Main Character Syndrome."
A type of condition characterized by one feeling as though the are destined to become a Main Character, through possessing attributes and/or having events happen in their life that cause them to become like the protagonist of any fictional story; having to go on a journey to locate and/or save something or someone, using unique talents or skills to forward mankind, having one's home taken away from them at an early age, and losing a loved one to an illness are all potential instances for Main Character Syndrome to occur.
"A small orphaned boy who grows up to be a prominent lawyer in his district once had Main Character Syndrome.