Agatha June, often referred to by the nickname Aggie, is the name given to the sole female member of the five-person team in the English adaptation of the anime series titled G-Force: Guardians of Space. This character is an Americanized version of Jun, also known as Jun the Swan, from the original Japanese series Science Ninja Team Gatchaman. In the context of G-Force, she operates under the command of Ace Goodheart as a vital member of the elite, bird-themed defense unit battling the alien forces of Galactor and their computer leader, Computor.

Agatha June is described as a young woman of significant capability and bravery. The show’s narration characterizes her by stating that she "flies like a dove, strikes like a falcon," and is "a match for the strongest on the team". This description underscores her dual nature; while her civilian identity might suggest grace and gentleness, her role as a secret agent demands aggression, agility, and formidable combat skills. Her primary weapon, a testament to the character's unique fighting style across all adaptations, is a yo-yo, which she wields with deadly precision. Her designated bird motif and uniform are those of a swan, and her position within the team's hierarchy is G3.

The motivations of Agatha June are intrinsically linked to the defense of Earth and her loyalty to her teammates. Her background, shared with the original character Jun, includes a history of loss. Orphaned at a young age and having lost an aunt who cared for her, she found a new family within her team, particularly developing a close, almost sibling-like bond with the youngest member, Pee Wee. This sense of found family serves as a powerful motivator in her fight against evil. Her civilian life also provides a contrast to her high-stakes missions; she runs a cafe or nightclub, which acts as the team's informal gathering place and home. In her free time, she enjoys riding her motorcycle, a hobby that reflects her independent and free-spirited nature.

Within the story, Agatha June serves as the team's technical expert, specializing in electronics, demolitions, and computer hacking. Her intelligence and technical prowess make her indispensable for infiltrating enemy bases, disabling security systems, and analyzing Galactor's technology. She is portrayed as strong-willed and independent, a "modern gal" for her time, who takes her combat duties seriously while also looking out for the well-being of her comrades. Her key relationships are primarily with the other members of G-Force. She shares a deep familial bond with Pee Wee, whom she has raised and protected. She also harbors a romantic affection for the team's leader, Ace Goodheart, demonstrating a more vulnerable, personal side beneath her capable exterior.

While Agatha June does not undergo a dramatic transformation within the single season of G-Force: Guardians of Space, her character is defined by her competence and reliability. She consistently proves her value not just in combat but as the emotional center and technical backbone of the group. Her notable abilities extend beyond her yo-yo skills and technical knowledge to include acting and disguise, skills she uses effectively during undercover missions. The development of her character is largely inherited from the original Jun, a young woman who balances her role as a fierce warrior, a caring surrogate sister, a loyal friend, and a young woman with her own dreams and affections, all while fighting for the future of humanity.