Take a look at the following examples.
The King and I
The other person and I
It's your fault, not the other person's.
The other person has left the room. I stay.
My person has left the room. He stays.
My person has left the room. The other person stays.
Sense and Sensibility; Pride and Prejudice; Calvin and Hobbes; Law and Order
How does one know when to use a noun or pronoun? Or is everything idiomatic? Do nouns come first, then end in a first-person pronoun? What is the order of arrangement of nouns?