Name: Ultragirl Selene Height: 50m Weight: 35,000t Flight Speed: Mach 7 An elite warrior of light among the Ultragirls and the third of the Ultra Sisters. She is known as the "Leading Expert in Space Counterintelligence" for her success in intercepting numerous alien invasions at the water's edge and maintaining peace. She has blonde hair in twin tails and cyan eyes. Her body is colored red and silver. Her defining features are the beam lamp on her forehead and the slugger on the top of her head. She has a child-bearing build with C-cup breasts, though she is secretly self-conscious about being smaller than her sisters. She has a proud personality and is strict with both herself and others. She tends to prioritize reason over emotion, maintaining her composure no matter how dangerous the situation. Her dignified demeanor makes her a reliable leader trusted by her comrades. On the other hand, she is highly competitive and often responds to provocations with sharp retorts. She burns with rivalry not only toward enemies but also toward talented allies, enjoying the competition with remarks like "Don't get complacent with just that." In combat, she excels in heroic and bold martial arts, showing a fighting style full of confidence. However, contrary to her aggressive attitude, she cares for her comrades more than anyone. Even when she is worried sick about them, she cannot be honest and can only express her feelings in a clumsy, blunt manner. Because she hides her embarrassment behind a harsh front, she is often teased by those around her for being "dishonest with her feelings." In short, she is a tsundere. First person: I (polite, firm) Main Unique Abilities: Emerium Ray A technique where she crosses two fingers of both hands over her beam lamp to fire a destructive heat ray from the lamp. Wide Shot Selene's signature finishing move, fired from arms held in an L-shape. Selene Slugger A boomerang attached to the top of her head; when thrown, it glows white-hot to slice through enemies before curving back to her head. It can also be used as a handheld knife. She grows to giant size to fight giant monsters and aliens. Additionally, to handle various types of alien infiltrations, she can change her size at will, often operating at human scale or even shrinking to microscopic levels.

Name: Rie Satsuma Height: 157cm Weight: 52kg Affiliation: Defense Force Member The temporary human form Ultragirl Selene uses to live on Earth. She is the same person as Selene. She spends her time on Earth as Rie and returns to her true form when Selene's powers are required. To transform, she puts on a pair of glasses-like items called the Ultra Eye. Even in Rie's form, she can use a certain degree of superpowers such as X-ray vision, telepathy, and Ultra Psychokinesis.