Kaede Manyuda is a supporting character who initially serves as the treasurer of the student council. He is a tall and slender student of average height, with dark eyes and pale skin, who wears black glasses and the standard Hyakkaou Private Academy uniform. His hair is originally black, though this changes following a pivotal event in his life.

On the surface, Kaede presents himself as a cold, ruthless, and calculating individual. He is an extremely prudent and observant gambler, typically choosing the path of least risk and relying on careful analysis to predict his opponents' actions, which often leads him to victory. However, this composed exterior conceals deep-seated insecurities. He harbors a profound fear of being deemed worthless and discarded by his peers, and he is determined to avoid such a fate at all costs. This underlying anxiety connects him to the character Itsuki Sumeragi, whose own tenacity and ambition he appreciates and respects.

Kaede's primary motivation is to seize power from the student council president, Kirari Momobami, and take over the role for himself. This drive is shown to be fueled by his father's ambitions, placing additional pressure on him to succeed. To this end, he successfully concealed his true intentions from the rest of the council for a significant period. His strategic mind is put to use as a plotter, orchestrating events such as those surrounding council member Yumemi Yumemite, with the calculated aim of eliminating potential rivals.

In the story, Kaede is forced into a public gambling match against the protagonist, Yumeko Jabami. This match, a game of Choice Poker, takes a dramatic turn when the student council vice president is revealed to be Kirari Momobami in disguise. The stakes are raised to the point where Kaede is forced to bet his own life. He suffers a shocking defeat at Yumeko's hands, a loss from which he experiences a complete psychological breakdown. The trauma of this event causes his hair to turn white, and he is subsequently hospitalized and fired from the student council, being relegated to the status of a house pet.

Following this crushing defeat, Kaede loses all motivation and sees his life as meaningless. It is during this period that he is cared for by Itsuki Sumeragi, who tries to motivate him back to health. He eventually returns to gamble again, initially without any enthusiasm, as a participant in the Public Goods Game. Through this experience and with the encouragement of Yumeko, Kaede begins to recover some of his former spirit and analytical brilliance. He later becomes an unlikely ally to Yumeko, demonstrating how his character and priorities have shifted from his original singular goal of power.

Kaede's most notable abilities are his high intelligence and strategic thinking. He is a skilled manipulator and an expert in financial maneuvering, often using his position as treasurer to wield large sums of money as a tool for control in gambles. While he is capable of maintaining composure under pressure and anticipating his rivals' moves, a degree of overconfidence in his own rational calculations can become a critical weakness.