Designing AI companions can be a daunting task. In this comprehensive guide, you will find everything you need to know about designing AI companions. From understanding your user's needs to designing engaging personalities and delightful interactions. The book highlights the research and user testing outcomes as best practices for reducing the complexity of technology and creating trustful connections between human and artificial intelligence. It will help and guide everyone, who is interested in designing new experiences, products, or services with artificial intelligence to design companions that are both personable and helpful by understanding the expressions of emotions and empathy with psychological, cognitive, and social theories.