Isaak is a white tomcat with amber eyes and brown tabby patches.
Isaak is the son of Helen and Paris. His sister is Alyona. He and his sister were born on The Farm while the cats were trying to find food for William, Ava, and Luke, the three orphaned puppies. The group of cats headed back to twoleg place soon after though, and the two were raised in the city from that point onward.