Heathcliff tends to act superior to the neighborhood cats and is usually considered to be one of the toughest cats in town. He is smarter than most of the neighborhood cats and has a habit of stealing food and causing trouble. Although he may appear to be a “bad guy,” he truly cares about his friends, his family, and his girlfriend, Sonja. He also tends to romantic, especially towards Sonja, and will usually become jealous when seeing her mingle with another cat.
Heathcliff is as an orange cat with various black horizontal stripes. He appears to be slightly overweight and has two black, conjoined eyes with a black nose.
Heathcliff cares dearly for Sonja, even going out of his way to steer her away from her crushes and into his presence. This is first shown in the pilot episode titled The Great Pussini when Sonja chases Pussini and claims he is the one she loves. As seen in the majority of the Heathcliff episodes, she is usually drawn by Heathcliff’s heroic deeds in the end, making their relationship unbreakable.