Gateau Mocha is a core member of the titular group in the anime and manga series Sorcerer Hunters. Distinguished by his unique background, he differs from most of his comrades who were raised together on Mount Saint Hordic, as he joined the team as an adult. His tragic past and primary motivation stem from a devastating family tragedy: the malevolent sorcerer Sacher Torte, also known as Zaha Torte, murdered his parents and abducted his younger sister, Eclair Mocha. This event drove him to a life of fighting against abusive sorcerers and led to his swift recruitment by his teammate, Chocola Misu, as he relentlessly searches for his missing sibling. Eclair later resurfaces as a brainwashed antagonist who believes Gateau is dead, seeking vengeance against the Sorcerer Hunters.

Physically, Gateau is the most imposing member of the team. He has a tall, muscular, bodybuilder-like physique with short, slightly spiky blonde hair and blue eyes, usually dressed in practical clothing such as jeans and fingerless gloves. His personality is a dramatic mix of extreme machismo and theatrical exhibitionism. He has a recurring habit of stripping down to a speedo and striking a pose while exuberantly declaring, "Look at meee!". Gateau is openly bisexual, explicitly stating that "beauty transcends gender," and exhibits a high libido, though he possesses more restraint and control compared to his teammate Carrot. A persistent running gag involves his overt and unrequited romantic pursuit of their androgynous teammate Marron Glacé, whose physical beauty captivates him, though his advances are consistently ignored. Despite his vanity and occasional lack of intelligence, Gateau has a good heart and displays deep loyalty and genuine care for his comrades, often taking on a protective, brotherly role towards the younger members like Tira Misu.

In the group's dynamic, Gateau serves as the primary close-quarters combatant and the team's powerhouse. He wields immense physical strength, which is the result of lifelong martial arts training. This raw power grants him a unique and notable ability: a partial immunity to magic, allowing him to resist or even shatter magical assaults through sheer physical force. He typically handles tasks requiring brute strength, such as breaking obstacles or chopping firewood. A significant development in the story reveals that Gateau is the divine reincarnation of Hokuten Kauruman, also known as Karlman, the god of the north, which links his immense physical resilience to a divine origin. His narrative arc consistently balances comedic traits with an underlying dedication to protecting his new family and achieving justice for his original one.