I just read a fiction book called High Tide by one of my favorite authors, Jude Deveraux, and I'm pretty sure the lead male character is ISTP. He likes birds and nature, and is building a bird sanctuary in the Florida everglades. He keeps his options open, hates depending on his family, has a sense of humor that surprises people, describes himself as a misfit in a huge family, because he wanted to be alone in the everglades instead of with everyone else, and he always has a placid expression on his face that shows no emotion. His eyes, on the the other hand, do show desire, humor and heat. And when he gets angry it's shocking and over quickly.
The lead famale gets very upset about his lack of facial expressions, and how he turns her questions back around so she's the one talking. (Seriously, that alone tells me he's ISTP!) But of course with all this, she still finds herself magnetically attracted . He's tall and has a beautiful, fit body. And he's quick in emergencies. In the everglades, while it's getting dark and she's feeling panicked about spending the night, he sets up a small tent so quickly she doesn't even see him do it.
Over several pages it says,
"He sad flatly..."
"But he just sat there looking at her."
"Ace nodded, his face showing no expression."
And then finally, in frustration, the heroine starts to leave the room, but he grabs her robe to keep her from leaving so she tells him she can't stand him, how boring he is, how cold and unexpressive, how he shares nothing, how any woman who agrees to spend the rest of her life with him will freeze to death being the same bed..."
And He says, " Is that so?" and in the next moment he gives such a hard yank on her robe that she falls down on top of him...
Yeah. This man sounds like an ISTP to me. :') | 
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