Look for functionindicative behaviors or actions . Fi is really easy to tell because the person ' s own passions and feelings and opinions and values come out a lot . This also implies Te . It should be easy to see which of the two is stronger in the individual squishy or stern ? Sometimes , also , it is easy to see a strong dichotomous option . A heavy E or I . Or a P or a J . But I agree with ujellydynomite , historic figures , fictional characters , and real life people can build a strong reference point . Just some off the top of my headENFP Spongebob , Michael Scott , Willy WonkaISTJ George Washington , Jamie Hyneman , my boringass deadinside calculus teacher fuck that guy , Ben Wyatt , Principal Skinner , the old guy from Up . ESFP Mr . Peanutbutter , Gob Bluth , the Six Flags guy , those fun crazy party girlsI ' d be happy to update this more , later , for all the types . Until then , here ' s my master list of fictional INTPs .