The character known as Guzula in some regions and as Binsky in others originates from the comedic monster egg, emerging from a colossal egg. This egg was expelled from the eruption of Mount Bikkura, leaving him orphaned and alone in an unfamiliar human world from the moment of his birth. His physical design is a whimsical and unclassifiable hybrid, featuring a round, stout body, a rhinoceros-like horn in place of a nose, a crocodile-like snout, a long dinosaur tail, and short arms, making his exact species a mystery. He is typically seen wearing a distinctive butterfly tie and a bowler hat, along with a swimsuit that often changes color between episodes.

In terms of personality, Guzula is defined by his stark contrast between his formidable appearance and his gentle, innocent nature. He is portrayed as being good-hearted, cheerful, and friendly, which allows him to easily make friends with those he encounters. Despite his monstrous abilities, he is remarkably naive, clumsy, and something of a glutton, with a tendency toward laziness and sleeping often. This combination of power and a lack of understanding of human society means he perpetually gets himself into amusing predicaments and troublesome situations, never out of malice but simply from his own childlike confusion and straightforwardness.

His primary motivation is not driven by grand goals but by the simple desire to live peacefully with the family that adopted him and to navigate the world around him. He is bewildered by the many strange and wonderful things he sees in human society, and his actions are usually reactions to his immediate environment, often making a mess of things while trying to help or simply explore. His role in the story is that of a force of comic chaos, an innocent monster whose presence turns everyday suburban life into a series of hilarious adventures and disasters.

Guzula's most significant relationship is with the suburban family that takes him in, allowing him to live in a shed next to their house. He is particularly close to the children of the household. The young girl, Susuku, is his friend and often the recipient of his help, while the boy, Bontha, joins them in their many adventures. His life is complicated by the arrival of Charara, a female monster similar to himself, who he brings to live with the family. Despite her needing to remain hidden and often scolding him for his lazy and clumsy ways, she becomes a key figure in his life, and the two share a mutual fondness for one another. He is persistently pursued by an antagonist in the form of a mad veterinarian who is obsessed with poking his tail with a giant syringe, an event Guzula desperately flees from, usually causing further destruction in his panic.

While specific character development across the series is not extensively documented, his nature as a static yet consistently charming character is central to the show's comedy. He begins as a lost, newly-hatched creature and quickly becomes a beloved albeit chaotic member of his human family. His core traits of innocence, friendliness, and clumsiness remain constant, serving as the engine for the episodic plots. There is a notable distinction between his portrayals in different adaptations, with his female counterpart, Charara, playing a more prominent role in some versions of the story than others.

Guzula possesses several notable and strange abilities that stem from his monstrous nature. His most famous skill is his ability to breathe fire from his mouth. He also has a powerful appetite for and ability to eat metal, which he can then process and use to produce a variety of mechanical devices from his mouth. In addition to these, he is capable of using his strong tail to perform tremendous leaps of up to ten meters, and he possesses significant physical strength, enough to crush a tank.