Tate is one of the notable characters. He's got a lot of emotional baggage and is involved in various disturbing events. His actions and personality contribute significantly to the show's plot.
Tate from American Horror Story is a character full of contradictions. On one hand, he can be very charming and seem almost innocent at times. But on the other hand, he has committed some heinous acts. He is part of the overall horror and mystery of the show, and his story arc is one that keeps viewers on the edge of their seats as they try to understand his true nature and what led him to do the things he did.
Tate in American Horror Story has no real-life counterpart. He's purely a figment of the show's imagination, designed to captivate and spook the audience.