Penumbra Characters and Myer-Briggs Personality Typology?

[nope]

I'm a bit curious as to what the character in the Penumbra Trilogy has when it comes to their personality typology. My memory isn't the greatest and I don't trust myself in remaining 'in-character' to simulate what results these characters might withdraw from a test.
Even then, regardless, I would like to see a discussion as well.

Resources (on this topic if anyone needs one):
http://www.humanmetrics.com/cgi-win/jtypes2.asp
http://www.personalitypathways.com/type_inventory.html
http://personalityjunkie.com/
http://www.mypersonality.info/personality-types/
http://www.personalitypage.com/