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Mamoru is the titular protagonist of the Mamoru-kun safety awareness program. He is a young Caninu who is following in his father's footsteps by wanting to be a Rescue Ranger. He also has a rivalry with the ninja thieves Nyanja and Monja.


Mamoru, a 4th grader in the children's fire brigade, can be described as a spry and courageous boy who's always ready to face danger for the sake of saving innocent lives. He is very cautious, often knowing when suspicious individuals are up to no good, with ???? being a prime example. While Mamoru isn't much for studying, his motor skills are outstanding which can be seen as he rides his bicycle. He is also very energetic, though his excitability can lead him into trouble sometimes.

Mamoru's family consists of his father Tasuku Yashima, his mother, his sister Matoi-chan, and his grandfather. While Mamoru seems annoyed by his sister on the surface, he still cares for her deeply.

Mamoru is a brown and white Caninu with reddish hair. His children's fire brigade attire includes a red, white and blue happi coat, matching shorts and boots, and a cap with goggles.


Mamoru has a few important pieces of equipment which he uses frequently:

  • Transmission Whistle - Mamoru's whistle is attached to the collar on his neck. The whistle is connected to rubber-like bands that can extend and retract from the collar. This whistle is connected to the Crystal Tower in the center of his town. When blown, the whistle transmits whatever information Mamoru needs to get out to the Crystal Tower, then the tower broadcasts the information into the minds of every person in the town.
  • Firefighting Gun - The backpack contains a compressor that allows the water stored in the tanks to be ejected at high pressures. The valve on the top adjusts the pressure of the water.


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In Solatorobo

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  • The name Mamoru (守る) means "to protect; to guard; to defend"
  • Considering how the world of Little Tail Bronx functions, the gem in Mamoru's whistle could very likely be a form of Juno