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SheWolf
I also fucking love Darth Maul. we can agree on that at least
He's such a vastly underrated character. He was about the only good thing to come out of The Phantom Menace.
Honestly, before watching Clone Wars there's no way I would have thought ISFP. Probably would have laughed at that suggestion. But, then again, when did his actual character actually show through? He spoke like, two lines.
But in the Clone Wars, he has so much more dimension. My argument for ISFP is his complete inability to detach from his emotions. There's no real logical reason to go after Kenobi. He doesn't just want to kill Kenobi, he wanted Kenobi to feel the same pain and shame that he had. He wanted to emotionally tear him down.
In fact, Sidious was able to make a weapon out of him because of his deep emotion and passion because that's what drives his very being. Once again, I see no weak Se in him, either. Inferior Se is a hesitation to engage directly in the environment and when it does, it's very clumsy; whether the Ni-dom is an Enneagram 8 or not. Maul's not clumsy with his environment at all, he just gets cocky and hell, his emotionality tends to throw him into some blind rage that ends up screwing him over.
I remember thinking "shit, this guy is an emotional mess" when watching the Clone Wars because that was just not what I was expecting out of him. But that just made me love him more.

Sexy beast, that one is.
his thinking is much more common sense, by the book and step by step like ISTJ. there is a certained grounded that INFJs lack (they're more interested in far-off theories, not as practical). if you're convinced of Ni, I would see INTJ before INFJ.
I see his Ni in his perceptions of Anakin. He told Qui-Gon the boy was going to be trouble. Qui-Gon literally tells him to "keep his mind in the present."
When would ever have to tell a Sensor this? They live in the moment totally on their own. He is a strategist, but that's Ni wanting to take the step-by-step action to achieve something in the long-term. An ISTJ would care about their immediate environment, right this moment. Obi cares about what things are going to bring in the long-term. He tries to pass on patience to Luke Skywalker and "trusting the Force."
As for Fe, he's very oriented to people, not necessarily Te efficiency. He was concerned about the effect of how the Jedi Council would view him and Qui-Gon when he takes on Anakin. He's pretty forthright with his feelings on things, though I find his morality is dynamic depending on the situation. I see no resemblance between him and Vader at all, honestly. In fact, he's pretty quick to notice when the "mood" of another is off. I see him as being quite emotionally attentive.