Uran is Astro's little sister. She is very mischievous and tends to get into trouble all the time. Physically, she is almost as strong as Astro, but she cannot fly. She can be a real brat at times but the bond between Uran and Astro is strong. Each has demonstrated that they are willing to sacrifice themselves for the other's safety. Uran was known as "Astrogirl" in the original black and white series.