Kilo appears to be a English Bulldog. He has brown fur and brown eyes. The fur around his right eye is black. Kilo has a green collar.
Kilo's name along with Watt's forms the word "kilowatt".
Pre Arc-League Championship
The morning of his Duel with Reed Pepper, Yuya exited the restroom of his house and was greeted by En, Core, Watt, Kilo, and two unnamed cats. Yuya speculated that the two new cats were strays picked up his mother.