Myers Briggs Type Index "personality test" version 2. because I don't like the idea of "oh your 51% a thing, lets just throw you whole heartedly into this category that doesn't necessarily fit you.

categories are
Extrovert, Ambivert, Introvert. "internal or external focus"
iNtuitive, Detectiving, Sensing. "how you digest information"
Thinking, eMpathising, Feeling. "How you make decisions"
Judging, fLexing, Perceiving. "How you live your life// planning and rule following or chaos and randomness"

Ambivert is just middle ground. detectiving is also middle ground, and empathing is middle ground, and flexing is you guessed it "MIDDLE GROUND!"
Instead of 4 general groups you get 9 groups and it can be more specific to you, though I don't have the know how to a make an actual survey for people to take