INTJ for people who care about that kind of stuff.
I fit within what people would call nerdy. I can tell you about the inconsistencies of each rendition of the Star Trek saga if you so wished. I'll study just about anything that holds my interest, and I'm prone to over thinking everything.
However, I contend that what some call nerdy, is the ultimate appreciation of life and the human spirit. I love life so much that I want to partake in this adventure of exploring every nuance it has to offer.
Perhaps my enthusiasm is nothing more then a case of arrested Development. I never lost that child like exploration, and sense of adventure.