Scully looks rigid and she's initially in contrast with Mulder's views, but she soon becomes curious and will turn to be fundamental for all the discoveries... I thought of her being LSI too, but she seems more Te valuing (facts and data), and Si because she keeps some objects as if they're a fetish of some kind... but it's her vibe~ really.. kind of SLI to me.

Mulder's motto is "I want to believe" and that's a pretty EII statement. For sure he's an Extroverted Intuitive, but I see him Fi valuing above all else. All that he does is because of his personal story.. and on top of that, he's very much a loner, not trying to reach a spotlight or convince everyone of his ideas (as an IEE would do).