So naturally, my favorite types of monsters are of the sci-fi persuasion. And of those, my favorite monster is the one that first blew my mind. By mind-blowing, I mean surprising, not great special effects. It's the monster that first made me think, and is one of the reasons I love sci-fi.
Yes, it is the horrible, terrifying "monster" from The Twilight Zone episode "Eye of the Beholder." For anyone who loves that show as I did, you know exactly what I am talking about. Beauty for them was a pig face, and the monster was a blond woman whom most humans would call beautiful. So yeah, what makes a "monster" can depend on perspective.
By the way, I've always believed that The Twilight Zone should be required viewing in high schools across America, and especially that episode. All kids, especially the bullies and bullied, should watch that show.