In Lenore Thomson's theory, the four-letter code "ISFP" stands for a person with:
Introverted Feeling as their Dominant Function
Extraverted Sensation as their Secondary Function
Introverted Intuition as their Tertiary Function
Extraverted Thinking as their Inferior Function
Profiles
Bearing in mind the Classification Mismatches, here are:
Joe Butt's ISFP profile
David Keirsey's ISFP profile
Brenda Muller's ISFP profile
Hirsch and Kummerow's ISFP profile
Hale's ISFP profile