Copper's species is listed as a "hybrid Malino". He's an orange pika-looking creature Malino with big jagged ears and a lightning bolt-shaped tail. His eyes are black and beady, and he has a yellow stomach. In Red Snow, his face is covered in bruises and bandages and he has several teeth missing due to Rinny's torture. He has electric powers too.
Now, he wears a 17th century British army uniform, he also wears a 17th century British imperial army cap and he has an army backpack.