Snowbell is the anti-hero and a (former) antagonist, later the deuteragonist of Stuart Little, the dueteragonist of Stuart Little 2, the tetartagonist of Stuart Little: The Animated Series and the tritagonist of Stuart Little 3. He is the Littles' pet house Kilala-like cat and Stuart's best friend. Even though he initially hated having "a mouse for a master" in the first film, Stuart eventually grows on him to the point where they repeatedly risk their lives for each other. He is the former main henchman of Smokey and Frederick's advisor.
Snowbell is very protective of certain family members, mostly Stuart.
Snowbell is seen as a friendly, shy, and lovable coward. He often focuses first and foremost on his own needs and frequently gets in trouble as a result.
In Stuart Little, Snowbell despised Stuart at first and lunged to eat him shortly after he arrived at the Littles' house and looked at the pictures. This prompted Stuart's parents to yell at Snowbell and demand that he spit Stuart back out (to which he does), and Frederick picks Snowbell up and sternly tells him that he shouldn't eat Stuart. He eventually becomes very caring for Stuart and redundantly agrees to tag along with him to fight the Falcon and save Margalo.
- Snowbell is the main antagonist-turned-tritagonist of Stuart Little, the dueteragonist of Stuart Little 2, a recurring character of Stuart Little: The Animated Series and the tritagoinist of Stuart Little 3: Call of the Wild.