Zero/BFM - MBTI Personalities  

Requires the XML Injector

What's inside the mod?

Obviously, the 16 personalities of the Myers-Briggs Type Indicator® 

These personalities are meant to sit in the background of the standard 3 personality traits from Maxis default to differentiate Sims a bit more.

They influence skill gain, a bit of autonomy, careers progresses, moods and especially, relationships. Sims will be more likely to gravitate around other Sims with a compatible personality and will get a relationship boost from being around Sims with compatible personalities. 

The skill gain boost isn't huge, and every personality has its specific set of skills where they excel, they also have a set of skills where they struggle (for example INFP gains creative skills faster but struggles with logic, and so on)

A Sim under stress will go in grip, showing some aspects of the opposite personality type (example ENTP/ISFJ) and will struggle with the skills they're usually best at. 

How to get started

Head to the PC, you'll find a new category under WEB

Levelling up this skill will unlock some interactions, and allow you to attempt to type (or re-type) other Sims like NPCs:

There is no limit on how many times you can retake the test and change MBTI profile for your Sim or for NPCs!

If you don't want to bother with the skill: my testing cheats are still inside the mod, enable testingcheats on and shift click on sims to give, change or remove the MBTI profile.

NPCs:

Npc sims can and will autonomously take the test. Once they took it, they'll not take it again unless you remove all MBTI personalities with the cheat. You can change the profile they got with the cheats or MBTI Typing Skill.

Notice that some personalities like INFJ are rarer to get than others regardless of traits. 

There are 5 possible matches and will affect how fast you can build a relationship with them and also how fast said relationship will decay as follow:

Ideal Match -> Friendship and Romance both decay slower

Kindred Match -> Friendship and Romance both decay slower

Complementary Match -> Friendship decays slower, Romance decays faster

Challenging Match -> Friendship and Romance both decay faster

Polar Match -> Friendship decays faster, Romance decays slower

Here is a chart of the compatibility between personality types: