What is an INTJ with developed Fi like?
An INTJ with developed Fi is what we might call a balanced individual. They are balanced about their feelings, emotions and values. INTJs may not be the easiest people to share their feelings or to socialize (trickster Fe aka PoLR Fe), but they are well aware of their own feelings and emotions. Their Fi is tertiary, which is in a valuable position. Fi is also a comforting function for INTJs. A healthy individual likes to use this function when they are recharging. Healthy INTJs like to reflect on their emotions and values when they are relaxing. Just like INTPs like to reflect on past experiences and memories (tertiary Si) when they are rejuvenating.
Long story short: INTJs with developed Fi look like balanced individuals with a good awareness of their emotions and values. They know who they are and what they believe is important to them. They look everything but the stereotypical robotic evil mastermind.