As said before the easiest most simple way to do it is by script, which as a newbie i suggest
Galcv's Message Busts
I find it the most friendly one for my opinion.
But if you want to do so without messing with script you can do it the following way
It's a made up stuff that i came up with on my first project when i wanted a bust character, maybe there's an easier way thou
First you going to work on the picture. Must be in format .PNG
1.Make a transparent picture(with no color at all, not even white) and size it to 544 x 298, which is the screen size without the text box
or get one here
2.Choose your character picture(again with transparent background) that you wish to display, And resize it to a reasonable size, commonly 170x280 (just don't pass 298 height, weight doesn't matter)
3.Paste your character picture on the clear picture you made earlier to either side, Bottom far left or Bottom far right, like so
Bottom Far Left Bottom Far Right
4.You put the finished picture in in your project folder/Graphic/Pictures
5.Start new event ->"Show Picture...." ->pick the picture you want ->"Show Text...."
*Don't forget to erase the picture or replace it when needed.
If you want two pictures on screen at once, just make two "Show Picture" before text, for each side of the screen and make them in different numbers