Copper

Appearance
Copper is a mix of brown and orange with a small white marking on her muzzle and the side of her neck.

Personality
Copper is mischevious and sneaky. She likes to steal her littermate's food sometimes and playfully tackle them. Being the biggest pup, she has an advantage over them.

Gold
Copper wandered off soon after being allowed outside the den but was easy to teach to stay near the den, possibly due to Sol and Slate's death. Gold was appreciative of this and tried to form a bond with Copper, however, Copper distanced herself from both her parents.

Cloud
Copper wandered off soon after being allowed outside the den but was easy to teach to stay near the den, possibly due to Sol and Slate's death. Cloud was also appreciative of this and tried to form a bond with Copper, however, Copper distanced herself from both her parents.

Sol
Copper was happy to wander off near her other siblings to let Sol get further away from the den, giving them a close bond. She didn't hesitate to pounce on her other littermates for him or to pounce on him for her littermates.

Slate
Copper would follow Slate to explore, and sometimes even take the lead on it. After being taught to stay near the den, however, she often disagreed to follow Slate and tried to convince her to stay in the den. This normally worked, but sometimes she would still wander off. After Slate's death, which followed Sol's, Copper distanced herself from her family since her two closest friends were gone.

Coal
Copper never had a close bond with the laziest of her siblings, but still play-tackled him and didn't treat him any differently than her other siblings other than not hanging out with him as often. After Slate and Sol's death Copper's bond with him almost vanished completely, only surviving on a tiny thread of bloodline.

Death
Copper was taken away by a hawk and killed soon after when Coal and her separated. Gold grabbed Coal and rushed to chase the hawk away, but the hawk grabbed Copper since Gold's mouth was occupied by Coal and unable to bit it.

Trivia

 * Copper is the last remaining female of her litter.
 * Copper's death was very similar to Trueno's, likely bringing back a wave of memories for Gold.