What the proper pronouns?

I assume you mean "What are proper pronouns?"

The most common proper pronoun is when people refer to God as "He", "She" or "Him". I suppose if God were actually real and you actually met Her then you would have to say "Nice to meet You". If Jesus was also there you could say you met Them. They are capitalized to show respect the same way that the names of people and places are capitalized. Note that I is always capitalized so presumably I is always a proper pronoun.