You’re MBTI type doesn’t change just because you’ve been put through living hell by a total psychopath, like Ramsay, and suffer from PTSD/Dissociative Identity Disorder symptoms, and grow up. Theon (post Ramsay) is still very much an ESTP (The Doer), just like he was back in S1-S2 when he was still a self-entitled dumbass teenage fuckboy.

However, he’s just grown out of his narcissistic fuckboy attitude, and become much more brave, humble, and emotional because he grew up, learned from his mistakes, and got put through living hell by Ramsay for nearly three seasons straight. But he’s still an ESTP to me. When he’s still brainwashed as “Reek,” he sells out Sansa’s escape plans to Ramsay because his logic has been skewed by his captor, and so he thinks it makes sense to tell Ramsay about Sansa’s escape plans to keep both of them safe, so messed up Ti-auxiliary. He doesn’t hesitate to push Myranda to her death to protect Sansa, and escape from Winterfell with her, and that’s Se-dom and Fe-tertiary.

He goes back to the Iron Islands again in S6 because he doesn’t feel like he’s worthy enough to stay with the Starks, after all he did back in S2, and thinks it makes more sense to go back to his home in the Iron Islands, even though it was revealed that he didn’t truly share the Iron Islanders lifestyle of conquest, murder, reaving, and raping back in S1-S2 at heart when he was still Pre-Reek Theon and went to go and see his father their. He supports his sister’s claim to the throne once he gets back to the Iron Islands because he wants her love and support, even though she’s a totally emotionally abusive bitch to him, and her ideals pretty much go completely against his own. He’s still very much Ti-aux and Fe-tert.