Creation
Sirius IV was created by Scott McCloud for the first color volume of Zot!, in issue 8.
Major Story Arcs
Sirius IV is the metaphysical embodiment of the planet Sirius IV, which exists in Zot‘s universe. She appears as girl who is 6-8 years old and wears violet.
Sirius IV is a largely mysterious, unknown being. King Gregory the First seems to have met her at some point, or at least knows her identity.
Zot also meets her one night, after he has stepped through the Doorway at the End of the Universe, which can only be opened by the Golden Key, objects which are worshipped by the people of Sirius IV the planet. That doorway leads to the future, where the spirit of anyone who has gone through the door is separated from their body and put in an automaton that looks like them.
Sirius tells Zot the origin of the Doorway. She says she created the Doorway, and all the planet’s religions, as a way to give people hope. She brings people to that future land because they helped Sirius in some way. This land is their reward, like a secular heaven. Zot’s mother and father are among those people.
She says that Zot will use the cultural influence he gains from having gone through the Doorway to change the civilization on Sirius forever. She disappears. Zot does go on to save the people of the planet from a group of conspirators and set them free.