Profundidade...

//Argument 0 = Text
//Argument 1 = The character sprite to use
//Argument 2 = The side the character is on

var character, cside, aux, text;//sets some temp variables
aux = 0;

io_clear()//clears all keyboard data

if argument2=0 then{cside=144-78}//if arg2 is 0 then the character on the left
if argument2=1 then{cside=144+46}//if arg2 is 1 then the character on the right

draw_sprite(Teste,0,0,0);

//draw_set_alpha(1)//transparent background
draw_set_color(c_white)//white background
draw_rectangle(144-80,144-40,144+80,144+40,false)//white transparent rectangle background

draw_set_alpha(1)//opaque background
draw_set_color(c_black)//black background
draw_rectangle(144-80,144-40,144+80,144+40,true)//black opaque rectanle background

draw_set_font(font0)//sets the font (I hope you have the "Small Fonts" font)

draw_sprite(spr_characters,argument1,cside,144+//draws the sprite on the side its supposed to be on

while aux <= string_length(argument0)
{
str = string_copy(argument0,0,aux);
draw_text(144-75,144-35,str)
aux+=1
screen_refresh();
sleep(20);
}

screen_refresh()//makes everything show up

keyboard_wait()//freezes the game until a button is pressed

screen_redraw()//redraws everything so the messages don't pile up on top of eachother