When I started this nativity business in 2008, I was so proud of the calm, simplicity of my design. It was so peaceful. At the time, I thought that adding more characters would just clutter it up, so I was very committed to not adding anything new. But, when inspiration comes, you just have to listen to it whether that's what you had planned or not. You can read more about that
here, but the summary is that I eventually started the tradition of adding a new character every year until I finally completed the set in 2015. I absolutely loved doing it. And knowing they have brought a lot of joy to a lot of people makes it even that much better.