I just started watching X-Files for the first time in January, and just started season 5 last night. Awesome show

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To me, Scully is somewhere between INTJ and ISTJ. Her wanting to settle down and have some semblance of a "normal" life make me think more SJ, but her willingness to work with Mulder for as long as she did, and her acceptance (though not immediate) of his ideas seem more N in nature. I can't see my ISTJ friends buying into Mulder...ever. Plus, she seems like a creative problem solver herself, she just does everything through the lense of science. So I'm leaning a bit towards INTJ.
For Mulder I'm stuck between INTP, INFP, and INFJ. He does seem very Ne to me, and compared to Scully, who seems very Fi, he could be more Fe, but I'm really not sure. INTP seems to fit the best on the whole, though nothing fits entirely. His search for his sister does seem more feeling-oriented, but at the same time, if someone had their sibling stolen from their living room right in front of them, without any decent explanation, I figure that would effect them pretty strongly regardless of type. His idealism could indeed be read as NF, but I woud call myself very idealistic, and I'm xNTP (though prone to bouts of cynicism, I remain an idealistic person at heart).
Oh my, typing fabricated characters can be difficult...