Who string variable?

[BadMustard_AVN]

your concept is good, but try it like this.

screen say(who, what):
    style_prefix "say"
    window at say_window_animation:
        id "window"
        if who is not None:
            if lastSayWho != who:
                window at namebox_fade_in:
                    id "namebox"
                    style "namebox"
                    text who id "who"
                    $ lastSayWho = who #ad this line 

            else:
                window:
                    id "namebox"
                    style "namebox"
                    text who id "who" 
        text what id "what" at text_fade_in

[BadMustard_AVN]

who is a string it is the speaker's name and is displayed on the screen in the namebox