Apparently the Myers Briggs test can has indicated what personality best suits librarians:
"The Myers Briggs Type Indicator (MBTI) confirmed some of the most deeply ingrained stereotypes in the 1970s and 1980s: that librarians are process-driven and shortsighted, and tend to shy away from any type of confrontation. The MBTI was used to determine an individual's personality based on four dichotomous scales: Introversion/Extroversion (I/E), Sensing/Intuition (S/N), Thinking/Feeling (T/F), and Judging/Perceiving (J/P). The Scherdin Study determined the following percentages for librarians' personality traits: 63 percent Introverted, 60 percent Intuitive, 61 percent Thinking, and 66 percent Judging. Traditionally, ISFJ was the personality type assigned to librarians, but Scherdin determined that the ISTJ and INTJ personality types were most prominent in librarians and were also found in the following occupations: Computer professionals, chemists, electrical engineers, high-level corporate executives, auditors, life and physical scientists, school principles, dentists, lawyers, and judges, according to CAPT's Atlas of Type Tables. Scherdin asserts that an array of dynamic qualities are needed to meet the challenges of the Information Age and staff MBTI profiles can help create strong project teams that work well together."
(Scherdin, Mary Jane, and Anne K. Beaubien. 1995. Shattering our stereotype: librarian's new image. Library Journal, July, 35.)