ROM Hack How change a nickname in a Savegame ?

[Aristide]

Hi ! I Want to change a Nickname in a Save File (SAV) with Action Replay (its possible).
But i don't find letters in address and i don't know how create a Cheatcode for change this.

I don't know if i'm understandable ^^

 

[KazoWAR]

The game in question might be using a custom character table, meaning the hexadecimal values for the characters could be anything.