What sorts of social and/or work roles do you think each type has?
INFP- The quiet guy that observes people and adds in a witty and/or self deppreciative yet hilarious comment every now and then.
The naive and out there yet insightful person.
That really shy girl that squirms in her seat when you stare at her and get her out of her daydreaming.
ESTJ- That guy that just cannot resist adding in his opinion in a way that it seems better than any other one.
Etc. These are from experience.