Which system is this?

 https://marcaccetta.com/personality-test-2/

Choleric (Red) Sanguine (Blue) Phlegmatic (Yellow) and Melancholy (Green)

https://helloim50ish.com/what-color-is-your-personality/

https://en.wikipedia.org/wiki/Two-factor_models_of_personality

http://trishwriter11.blogspot.com/2012/11/personality-types-blue-yellow-green-red.html