Estrelita, known as Diana Worthy in English, lives on a large ranch with her father, Pops Worthy. She is among the first humans encountered by Prince Planet when he arrives on Earth from Radion, adopting the identity of Bobby. Estrelita becomes a companion to Prince Planet/Bobby. Her character frequently faces perilous situations involving antagonistic terrestrial and alien forces, often requiring assistance or rescue from Prince Planet. Within the group dynamic that forms around Prince Planet, her role is primarily supportive. This group expands to include Dan Dynamo, a wrestler introduced in episode 2, and AjiBaba, a magician introduced in episode 4. Together, they combat various threats. No documented character development or evolution exists for Estrelita across different media formats like movies, OVAs, or spin-offs.