Kenji Asuka is a key member and leader of the Crasher Squad, Earth's elite space-defense force against extraterrestrial threats. As captain, he coordinates defensive operations and missions, piloting advanced combat vehicles and specialized mecha units into strategic engagements with hostile forces.

He operates directly alongside protagonist Takeru Myojin (Mars) and teammates Naoto Ijuin, Mika Hyuga, Akira Kiso, and Namida Akashi, confronting the Gishin Empire. Kenji demonstrates a protective attitude, especially toward younger members like Namida, reflecting his duty to safeguard both civilians and colleagues.

His leadership provides stability and support within the team dynamic. He maintains a critical cooperative relationship with Takeru during battles against Emperor Zuul and his generals.

Across all official media, including the television series, the 1982 film God Mars: The Movie, and the 1988 OVA God Mars: The Untold Legend, Kenji is consistently depicted as a courageous and committed soldier focused on the Crasher Squad's objectives, relentlessly prioritizing collective safety and mission success throughout the conflict with the Gishin Empire.