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 Japanese versions of the games, the player is asked to name themselves in both Japanese and English to allow them to appear in the credits.

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 when Flint offers a prayer before entering the Sunshine Forest. The name is later confirmed in Chapter 4 by Mr. Brown. The player's name is used at the very end of the game, which is only activated if the player moves the END? message as if it were a character in the story. They speak to everyone who survived the awakening of the Dark Dragon.

Hard mode
In the Mother 3 fan translation, if the player names themselves "HARD MODE" at either time in the game, the difficulty of enemies will increase, including a raise in enemy stats, lower experience gained upon winning, etc. If done in Chapter 1, it can be reset in Chapter 4 if the player enters any other name when speaking to Mr. Brown. To get a message informing the player how to access hard mode, all enemies must be recorded in the Battle Memory before speaking to the final Save Frog in the game. The enemy's alternate sprites do not need to be recorded, however. Despite this, hard mode can be accessed even without seeing this message.