Copper

Copper is one of the two main characters in Disney's 1981 feature film The Fox and the Hound and its midquel (the other being Tod). He ends getting corrupted by Fagin to try and backstab Amos Slade at the right time for hunting him earlier in the film, which explains the dark fog surrounding him in the final battle.

The Fox and the HoundEdit
Baby CopperAdded by Daniela EspinozaHe is introduced as a small puppy that Amos Slade had recently obtained. Amos Slade intends to train the puppy as a hunting dog, and instructs his older dog Chief to look after him. One day, Copper wanders off, intent on following an unusual scent and ends up meeting Tod the fox kit. The two play together and become good friends, not realizing the two are natural enemies. Copper must keep his friendship secret, and often sneaks off to play with Tod. Copper's owner, Amos, is an avid hunter while Chief is a trained hunting dog, and the two would certainly kill Adult CopperAdded by Daniela EspinozaTod if given the chance. Eventually, Amos grows tired of Copper running off and ties the puppy to his doghouse. Tod comes over to see why Copper isn't coming to play. When he sees that Copper is tied up, the fox kit attempts to play there, but Copper worries that Chief will awaken. Chief awakens afte

r smelling Tod, and chases him across the woods with his house still attached. Amos chases after them trying to shoot Tod, believing the fox cub was harassing his chickens. Much to Copper's relief, Tod is able to escape successfully.

Soon after, Copper is taken on a long hunting trip with Slade and Chief. During the winter,Copper grows into an adult and becomes a skilled hunting dog. When spring arrives, Copper returns, having helped Amos obtain a large amount of skins. That night, an adult Tod comes over to see Copper, but Copper tells Tod that they can no longer continue their friendship. Copper is now a hunting dog, and Tod is a fox. Suddendly, Chief and Amos catch Tod on the property and Copper is forced to track his former friend. Copper doesn't want to see Tod killed, and so he lets the fox get away. However, Chief notices Tod, and chases him onto a railroad bridge. When a train comes, Tod is able to escape, but Chief is badly injured. Copper immediately regrets letting Tod go, and vows revenge.

When Amos and Copper realize that Tod's owner, Widow Tweed has released Tod into the game preserve, the two decide it is the perfect opportunity to get revenge. Copper and Amos are able to track Tod to a den, where the he is staying with Vixey, a young female fox. Amos sets traps along their path, but the two foxes are able to avoid them. Setting a fire near one den entrance, Copper and Amos wait at the other entrance. Both are shocked when Tod is able to escape through the flames and avoid them, and Copper gives chase. During the chase, Copper and Amos inadvertently aggravate a bear, but despite of losing his shotgun whilst trying to escape from the bear, Amos is caught in one of his own traps, and so Copper tries to attack the bear and defend his owner. Copper is beaten badly and no match for the bear, when Tod arrives to defend his former friend. Tod is able to defeat the bear, but is hurt. Amos arrives to kill Tod, but Copper stands in the way of the gun, saving Tod's life. Copper returns home with Amos, fondly remembering his friendship with Tod.

Role in the series
Copper reprises his role from the movies, but also gets corrupted by Fagin, who senses the darkness within Copper's heart, and tries to turn the dog into the Villain League's Wolf commander, while also obtaining his heartless for the darkness. Fagin planned to have the corrupted Copper pretend to serve Amos Slade loyally, and then when Tod and Vixey would be killed, Copper would, at the signal from Ratigan, immediately betray and kill Amos Slade as revenge for Fagin's near shooting by the hunter. Sora managed to destroy the creature possessing Copper, only for it to then possess the Bear, leading to the true final boss of the film.