Marshall is the team's fire pup, as well as the medic pup. It's the Chase's best friend.
In the PAW Patrol, Marshall is usually the comic relief of the group, as he tends to be goofy and clumsy. He is quite accident-prone and gets a lot of slapstick injuries, crashing into things such as the pups at the Lookout elevator, falling off his ladder and getting his head stuck in things. He is very excitable, a bit air-headed, and not particularly well-coordinated. He can be immature sometimes. When he is excited, he usually howls. However, when it comes to doing Pup-Fu, he is quite agile. He tends to make jokes (most often puns) when he collides into the other pups in the elevator, with mixed reception.
Like all members of the Paw Patrol, Marshall has a collar that can be used to summon Ryder and his teammates.
His vehicle is a fire truck. It is equipped with firefighting equipment such as a tall ladder and an attached fire hose.
Marshall has his own high-tech pup-pack which he uses during missions. Marshall's pup-pack can transform into a water cannon, which Marshall primarily uses to fight fires. The source of water that the cannon uses comes from the tanks that are installed on the sides of the pup-pack. Marshall's firefighter's hat also has a retractable visor capability.
His main catchphrase is "I'm fired up!".