Heinlein x Mary Sue
A Mary Sue should be able to raise a perfect family, lead an invasion, teach all of the people and animals of the world to be vegetarian, command a fleet, design an architectural wonder, write a world-changing book, obviate the need for money, build an impregnable defense, cure an incurable disease, restore the dying to health, re-interpret "orders" to mean what she wants, give orders that save the day, show them show them all, overcome a tragic past, solve problems that have stumped experts, outsmart any attempt at trickery, change her eye colour, destroy a computer with illogic, create a food synthesizer from pocket stuff, defeat the villains, outshine the heroes. Anything less is for background characters.