Gen (short for Hydrogen, the only element in existence when she was born) is the all-knowing judge found in the Neutral Zone between the Bad Place and the Good Place. She rules on cases brought to her, such as that of Eleanor, Chidi, Jason, and Tahani in Chapter 25: The Burrito.

It can be assumed that she was also responsible for deciding on the case of Mindy St. Claire, which led to the creation of The Medium Place.