The player

The player is simply whoever is playing the game, and can be given their own alias in-game. They are mentioned in all three games, and play a vital part in EarthBound and Mother 3.

In
The option to name the player is first presented in Snowman. Inside of the healer's house, if Ninten picks up the phone, his father will call and asks for the player's name. If he does not go to the phone in Snowman, another opportunity arises in the swamp east of Youngtown, where Lloyd's father asks for the player's name if they have not entered it in yet. If they already have, he allows them to change their name one last time before confirming it.

Unlike the two games after it, however, the player is not acknowledged by the in-game characters, and simply appears in the ending credits.

In EarthBound
The first time that the player is ever mentioned is in Summers by Tony on the phone. He breaks the 4th wall by asking the player to say their name and to make sure to take care of Jeff for him. Later, after Ness and his friends cure the Tenda of their shyness problem, the Tenda chief asks the player to sign his or her name, giving them one last chance to confirm their alias. In the final battle, after Paula runs out of people to pray for, the player prays for Ness and his friends, dealing the final damage needed to defeat Giygas. Finally, the player is given a special thanks in the credits.

In Mother 3
The player is first asked for their name in Chapter 1 if Flint offers a prayer before entering the Sunshine Forest. The name is later confirmed in Chapter 4 by Mr. Brown.