Capper is a male anthropomorphic cat in The Snowstorm Squad. He is a Klugetown con artist and former aristocrat from Abyssinia. He is called Capper Dapperpaws in some merchandise.
Capper is portrayed as smooth-talking, streetwise, and opportunistic, able to charm others with his charismatic personality and quick wit. He initially sees the Mane Six as a means to settle his debt, but after Rarity's show of generosity, he chooses to help them by throwing Tempest off their trail in spite of the risk to himself. Capper also demonstrates heroism and loyalty by joining Twilight's friends in their campaign to rescue Twilight and free Canterlot from the Storm King's iron grip.
Prior to The Snowstorm Squad
He first appears curiously noticing the Mane Six when they enter Klugetown. When the ponies attract too much attention from the Klugetowners, Capper scares them off by claiming the ponies are infected with the fictional pastelus coloritis. He then offers to serve as the ponies' guide and protector through Klugetown on their way to find the "Queen of the Hippos", but he secretly makes plans to sell the ponies to crime boss Verko in order to settle his debt. Capper charms Twilight Sparkle's friends, and Rarity surprises him with a generous gesture as thanks for helping them. Twilight learns that the "Hippos" they seek are actually the Hippogriffs and that Capper was less than truthful with them. Before Capper can escort the ponies to the Hippogriffs' location, Verko appears, exposing Capper's true dishonest intentions. After the Mane Six escape from Tempest Shadow on a departing airship, Tempest takes Capper prisoner and demands to know where they're going, Capper, remembering Rarity's earlier generosity, points Tempest toward Black Skull Island in the opposite direction.
When Capper's deception is later revealed, Tempest punishes him—as well as Captain Celaeno and her pirate crew for harboring the Mane Six in secret—by destroying their airship and stranding them on the Basalt Beach. Later, after Twilight is captured by Tempest and taken back to Canterlot, Capper appears before Twilight's friends and offers to help them save her, along with Captain Celaeno's crew and Princess Skystar. In order to sneak into the city, Capper poses as a chef delivering a congratulatory cake to the Storm King that the pirates and Skystar hide inside, and the rest of the Mane Six pose as Capper's prisoners. Though they successfully infiltrate the heavily guarded city, their facade is soon exposed, and they are forced to fight their way past the Storm King's forces. At one point, Capper works with Rarity to tie up some Storm Guards with a giant ribbon, and later uses Spike as a flamethrower to fend off more Storm Guards. When the Storm King creates a twister to rip the city apart, Capper helps Twilight's friends break through with Pinkie Pie's party cannon. After the Storm King is defeated, Capper joins his new friends in celebrating at the Friendship Festival, and Rarity presents him with a new cape and top hat.