See Notes and Credits
So that box you see is the like the 2d volume of all npcs, so like the length of the box is the height of the character, and the width of the box is the width of the character, not too tall, nor too short, and other things, make sure the outline is full black, and make sure it doesn't look too realistic, if you want a taste of what i mean: check this: https://scratch.mit.edu/projects/715176163/