Rose Quartz (from Steven Universe). She is Steven's mother and a CrystalGem. We (the fans) are not pretty sure what happened to her, but we have some headcanons/theories about her. Sometimes, pepole compare her to Serenity (from Sailor Moon), and I couldn't help but see the itty-bitty similarities they have. I repeat, we're not sure of her fate, but we hope to see a Rose-centric episode about her fate...Maybe one day.