Ask questions about INFj and INFps. Answer the questions that you've observed answers to.
When they're being playful/silly, how is each of them silly?
What are the differences in their approaches to romantic relationships?
What type of confrontation is each the most uncomfortable with?
How does each type respond to uncomfortable confrontation?
Which is more likely to have a lot of conspiracy theories?
Which is more likely to blame other people for their problems?
Which is more likely to blame the situation for their problems?
What types of humor does each of them prefer?
What is most likely to piss each of them off?
How is each of them most likely to respond when they're pissed off?