Board Thread:General Discussion/@comment-366087-20151027201544/@comment-24891101-20151027213706

In that case, there is exactly one alien, and can be special-cased, like Penny, who we weren't mentioning earlier. The system should be generalizable, though. You can continue to special-case things, but once you get enough of another single category, you need to give everything that category.

Yes. Because I want a list of every human in the series. How do I do that easily?

The point of the system is not to minimize the number of moving parts, but to make it easy for the reader.