The Soul Eater anime only mentions one Meister who created a Death Scythe, and that was Maka's mother with Spirit Albarn being the Death Scythe she created.
When the other Death Weapons arrived in Death City after Asura's release, we did find out that the Death Scythes were stationed around the world. However, the anime didn't reveal who their Meisters were, or even what happened to them.
So I am wondering: What happens to a Meister when their Weapon Partner becomes a Death Scythe? Would the process be different with Kid and the Thompson Sisters? (Kid stated that he would rather use a Death Scythe he made than one of his father's)