Doggie Kruger, also known by his transformed alias Deka Master, is the commander of the Earth branch of the Special Police Dekaranger unit. He is an alien from the planet Anubis and a member of the Shep-Tribe, which accounts for his canine-like appearance. He holds the rank of Chief and is widely respected as a living legend within the organization, having earned the formidable nickname Hell's Guard Dog based on his exploits as an active officer in his youth.

As a leader, Doggie Kruger presents a stern and demanding exterior, but this toughness is underpinned by a strong sense of honor and profound care for his subordinates. He is a figure who clearly separates his professional duties from his personal feelings, yet he is deeply committed to protecting those under his command. This dedication is absolute, and he will go to great lengths to ensure the safety of the people he cares about. Despite his serious and commanding presence, he has a notable softer side, particularly regarding his assistant, Swan Shiratori. He reacts with visible anxiety or panic whenever the subject of Swan having a potential admirer arises, hinting at deeper personal feelings for her.

In the context of the movie Tokusou Sentai Dekaranger The Movie: Full Blast Action, Kruger serves as the steadfast commander of the Dekarangers, guiding them from the Deka Base. His primary motivation is to uphold justice and eliminate the Alienizer criminals who threaten Earth. While he typically assumes a supervisory role, he does not hesitate to enter the fray when the situation escalates beyond the team's capabilities. In this film, his role as a combatant is demonstrated when he transforms into Deka Master, displaying overwhelming power by swiftly defeating multiple enemies in a single engagement.

His key relationships are central to his character. He acts as a mentor and father figure to the five main Dekarangers, pushing them to grow and relying on them to handle most field operations, as he is wary of them becoming too dependent on his own strength. His closest confidant is Swan Shiratori, who manages the base's mechanical systems and for whom he harbors a protective affection. These relationships define his role, as he balances being a distant, commanding boss with being a powerful, protective ally.

Doggie Kruger's character development is subtle but present. While he begins as a somewhat mysterious figure who keeps his identity as Deka Master a secret, he becomes more directly involved when his friends are in danger. His legendary status is demonstrated through his development as a warrior, having mastered a specific sword fighting style known as Ginga Ittoryuu, or Galaxy Single Sword Style, which he learned from his own sensei to unlock its secret technique, the Vega Impulse.

His notable abilities are formidable. Even in his base form as an Anubian, he possesses enhanced physical traits, including a highly developed sense of smell that can see through disguises. As Deka Master, his combat prowess is exceptional; he is a legendary swordsman who wields the powerful D-Sword Vega and has been known to single-handedly defeat one hundred enemies. His speed and skill are such that he can defeat an entire team of Rangers in a matter of seconds. His ultimate techniques, including the Vega Slash and the more powerful Vega Impulse, are capable of instantly eradicating his targets. The specialized Deka Master suit also provides significant protection, reducing impact damage and offering resistance to extreme heat and radiation.