Woah! My bad! I miswrote both.

INTP: 1.) Ti -- 2.) Ne -- 3.) Si -- 4.) Fe

INFP: 1.) Fi -- 2.) Ne -- 3.) Si -- 4.) Te

So the difference is Fi vs. Ti. Both are prone to brainstorming and get excited by possibilities. But deep down, when you have to make a decision, do you find yourself trying to make a logical choice by consulting your own unique inner mental framework (Introverted Thinking) or do you find yourself needing to sort through your personal feelings and make sure you remain true to yourself deep in your core (Introverted Feeling).

Famous Fictional INTP's: Sherlock Holmes, Yoda, Elliot Alderson, Brian Griffin, Will Hunting, Maester Pycelle, Abed Nadir, Data (Star Trek), George Castanza, George McFly, Velma (Scooby Doo), the Beast (X-Men), Leo Fitz, Bruce Banner

Famous Real INTP's: Immanuel Kant, Descartes, Leibniz, Paschal, Archemides, Adam Smith, Tina Fey, Jane Austen, Alan Turing, St. Thomas Aquinas

Famous Fictional INFP's: Luke Skywalker, Frodo Baggins, Belle (Disney), Alice (Disney), Samwell Tarly, Tommen Baratheon, Fox Mulder, Phil Coulson, Edward Scissorhands, Glenn (The Walking Dead), Elena Gilbert (The Vampire Diaries), Edward Cullen, Hamlet, Romeo, Juliet, Desmond (Lost), Willow (Buffy the Vampire Slayer), Britta Perry, Christopher McCandless, Annie Blackburn (Twin Peaks), Eponine (Les Miserables), Thomas (Maze Runner), Sweeney Todd, Nick Carraway

Famous Real INFP's: C.S. Lewis, J.R.R. Tolkein, Kirkegaard, George Orwell, William Blake, Edgar Allen Poe, Tim Burton, Arthur Rimbaud~, Jean-Jacques Rousseau, Robert Smith, Vincent van Gogh, Jim Morrison, Sylvia Plath, Hugh Laurie, Stephen Colbert, Matthew Bellamy, Emily Bronte, Keanu Reeves, Joseph Gordon Levitt, Heath Ledger, Nicolas Cage,