I think true INFJs are ambiverts by design. Equally extroverted as we are introverted because we need to be around people in order to understand them and enjoy helping them, but then we need to be alone afterwards because too much empathy can wear you out, ya know?
I empathize way too easily with fictional characters. Even bad guys getting their comeuppance in the form of humiliation just makes me feel bad for them.
The NF cluster: INFP, INFJ, ENFP, ENFJ.
Abstract thinkers who approach situations in a cooperative mode.
- David Keirsey, Please Understand Me II