Kasha Imhof is a principal character and one of the primary pilots of the Ideon. She is a teenage colonist living on the planet Solo when the human race makes its first contact with the alien Buff Clan, an event that quickly descends into a violent attack on the colony. She, along with Cosmo Yuki and the adult Bes Jordan, escape the destruction by boarding three ancient vehicle found on the planet, which combine to form the giant robotic warrior, the Ideon. In this formation, Kasha pilots the component known as the Sol Conver or Ideo-Buster craft, which forms the legs of the complete mecha, and she is primarily in charge of missile weaponry when the Ideon is fully combined.

A gifted individual who has earned a rocket mechanic's license, Kasha immigrated to the Solo colony as part of the technical class. Having lost her parents when she was young and grown up in an environment with only two extreme seasons, she developed a strong, self-reliant, and fiercely independent spirit. This background forged a personality that is hot-tempered, impulsive, and aggressive, with a strong sense of pride and a desire not to lose to anyone, particularly her fellow pilot Cosmo, with whom she frequently argues. Despite this combative exterior, her abrasiveness is often an outlet for her deep-seated insecurities and a method of drawing attention. Beneath this tough facade lies a profound capacity for loyalty and fierce protectiveness, especially toward the younger and more vulnerable members of the Solo Ship's crew, such as the children Lou, Ashura, and Fard.

Kasha's primary motivation throughout the series is survival and the defense of her fellow refugees. She is driven by a powerful fighting spirit, often displaying more anger and a bloodthirsty, no-surrender attitude in battle than her male colleagues, and she frequently clashes with the more cautious or pacifistic opinions of the adults in command. One of her most defining character arcs involves her relationship with Karala Ajiba, a Buff Clan princess who joins the human survivors. Kasha initially harbors an intense and open hostility toward Karala, blaming her directly for the deaths of colonists during the Buff Clan's first assault. This resentment is rooted in Karala's alien origins and the perceived responsibility of her people. However, as the narrative progresses and the crew endures countless hardships together, Kasha's perspective gradually shifts. Her deep-seated distrust lessens, culminating in a moment of genuine happiness and reconciliation when she learns of Karala's pregnancy, showing a capacity for empathy and emotional growth beyond her earlier animosity.

Throughout the desperate flight from the pursuing Buff Clan, Kasha manifests obsessive tendencies in her piloting, constantly trying to outperform Cosmo and prove her own worth. This competitive drive is later revealed to be a complex method of seeking his attention and validation, hinting at a deeper, unspoken romantic tension that develops between them. She is a character defined by a constant struggle between her rash, emotionally driven nature and the brutal, unforgiving reality of war. Her story concludes tragically during the final, apocalyptic battle with the Buff Clan flagship. While actively protecting a child from harm, an explosion shatters the visor of her cockpit, and flying glass shards inflict fatal injuries, cementing her ultimate role as a guardian willing to sacrifice everything for the vulnerable people around her.