While they are indeed older than the BZPB Multiverse, contrary to many beliefs, they did not create it. The true Creator Supreme (The Architect), created the BZPB Multiverse and all of its dimensions, leaving the Chousin in charge of nurturing and regulating time, space, and life, so that The Users could regulate their characters. However, Washu has sealed portions of her own power in other beings of unknown identity so that she can study the Universe on a more personal level. She also seems to have made an assistant of Zev Raregroove, and has a daughter of sorts.