[rozoweskarpetki]

In the MBTI system you get your "opposite" if you reverse the two middle letters rather than all four. The idea behind MBTI is that we can sort of generalize that there are four ways to take in information from our environment and four ways to make decisions based on the information we gather. All people can use all of these, but everyone will have their preferences.

The order of preference for an ENTJ is:

1. Extraverted Thinking
2. Introverted Intuition
3. Extraverted Sensing
4. Introverted Feeling
5. Introverted Thinking
6. Extraverted Intuition
7. Introverted Sensing
8. Extraverted Feeling

So the opposite of this is an ESFJ:

1. Extraverted Feeling
2. Introverted Sensing
3. Extraverted Intuition
4. Introverted Thinking
5. Introverted Feeling
6. Extraverted Sensing
7. Introverted Intuition
8. Extraverted Thinking

For Erin, as an ENFJ, it would be:

1. Extraverted Feeling
2. Introverted Intuition
3. Extraverted Sensing
4. Introverted Thinking
5. Introverted Feeling
6. Extraverted Intuition
7. Introverted Sensing
8. Extraverted Thinking

So I guess we could conclude that the way you take in information is very similar (all the perceiving functions are in exactly the same positions for ENTJs and ENFJs), but the way you arrive at decisions and opinions is vastly different (the judging functions are in completely opposite positions).