We can't administer the MBTI to Daria characters, but with some guesswork we can peg more than a few personalities in the series. I've mentioned Upchuck in a previous post, but here we will go after bigger fish: namely Daria and Jane. Let's cut to the chase and give you the personality types that each of them seems to be (to me, but feel free to argue it), with some reference links to give you a clearer idea of what the test result means. Take a minute to read the links and see if you agree with my assessment.
Daria Morgendorffer: INTJ
What do you think? Food for thought there? For those interested in checking out the original book at the local library, there's an updated version available. While you may not wish to take the test results too seriously for yourself, the book is an excellent thumbnail guide to personality types you can use in fanfiction, the Daria show being no exception.