Heizak is a supporting character in the anime Glass Fleet, known for being a member of the crew aboard the glass battleship commanded by the protagonist Cleo. He is visually distinguished by his tanned skin, gray eyes, and short gray hair. Among the motley group of pirates and outcasts that make up the ship’s company, Heizak stands out for a very specific and unusual trait: he is said to possess one hundred secret skills. This characteristic defines his role within the group, as he is often called upon to apply one of his many talents to solve a problem or perform a specific task that the situation demands. His proficiency extends to operating the ship’s cannon, making him a key asset in combat scenarios.

Heizak’s personality is largely conveyed through his competence and the peculiarity of his vast and diverse skill set. The fact that he is able to list his one hundred secret abilities, and at one point has to pause and think after finishing the list, suggests a methodical and perhaps eccentric nature. He is a reliable and valuable member of Cleo’s crew, contributing to the group's efforts to aid the People’s Army in their resistance against the Holy Empire. Unlike the more impulsive members of the team, Heizak appears as a steady and capable presence, ready to apply whatever hidden expertise is necessary for the mission at hand. His physical appearance includes a unique helmet, which adds to his enigmatic and seasoned legionnaire-like aura. While the full extent and nature of his hundred secret skills are not exhaustively detailed, this defining characteristic remains the central aspect of his contribution to the story and his interactions with fellow crew members like Eimer, Nowy, and Barrett.