Perfect Ninja: a Children’s Book about Developing a Growth Mindset. Perfect Ninja must do things perfectly. When his own expectations aren't met, he becomes frustrated and ends up breaking down crying, screaming, or giving up. But everything changes one day when a friend shows him that mistakes and failure are the best teachers to help us learn and grow. Find out what happens in this book about perfectionism and how avoiding mistakes can end up being the enemy to growth and development.