Self-voicing is a feature for people that cannot read the text (for example blind). The self-voicing feature reads all the text out loud, including character names. This feature is integrated in most Ren'Py-made games, because Ren'Py's default project template contains it.
Self-voicing can be toggled with the V key.
Ren'Py wiki (self-voicing): https://www.renpy.org/l/voicing


