I didn't read any of the posts here. Is @Ene claiming that Murdock is an INFJ? I think I agree. Murdock is definitely not a ISTP. Too idealistic (NF over SP), too much in control of his emotions and he hides/sacrifises his inner sensitivity for the greater good (seems like Fe) and he is definitely a I. So that would make him NF, Fe and I (INFJ).
Although what I described above describes of a person who sounds quite nice it doesn't mean he/she is a easy man/woman to live with. Which means I don't think Murdock is an easy man to live with as a partner unless the person has equally high ethical and self sacrificing life code.