I am actually so serious I think it really messes with a childs creativity and joy to tell them to never make a mary sue OC. Like that unbridaled form of joy where you make a self insert OC who super cool and everyone loves them and they have every superpower in the world SHOULD be something a kid makes, it nourishes their ability to create things for fun and not be stifled by "oh but what if my character is too overpowered and cringey...". whatever