TV-Series
Description
Ooka Tadasuke, also known by the fuller name Ooka Echizen no Kami Tadasuke, is the magistrate of the South town of Edo and a senior figure in the city's administration. He is presented as a brilliant man who is heavily involved in city policy and is considered the smartest man in Edo. In appearance, he wears a samurai-themed outfit together with a straw hat and glasses, and he has black hair and blue eyes, a look that has earned him the nickname of the four-eyed samurai.

In personality, Ooka is calm, tactical, and careful in almost every situation. He approaches problems with a composed and calculating mindset, preferring to assess circumstances before acting rather than charging in recklessly. He possesses a strong sense of justice and responsibility, and he is deeply committed to the welfare of the people under his jurisdiction, a sternness that makes him a feared presence for criminals and lawbreakers. He also displays great loyalty to the shogun, Tokugawa Yoshimune, and to the institutions he serves. One of his defining traits is his habit of bluntly rejecting behavior he considers reckless or improper; his characteristic phrase is "it is wrong," which he uses whenever someone acts in a way he believes could jeopardize a mission. His strict, disciplined nature can make him seem rigid and demanding, particularly toward subordinates, and he can become quickly irritated when those in his care are placed in danger. Even so, he is capable of reflecting on his own mistakes and adjusting his approach when circumstances require it.

Ooka's motivations center on maintaining law and order in Edo and ensuring the success of the campaigns against the giant insects that threaten the city. His actions are driven by duty, loyalty to the shogunate, and a genuine concern for protecting the people, rather than by personal ambition or glory. As a magistrate, he works largely behind the scenes to guide operations, shape city policy, and make the strategic decisions that allow the warriors under his authority to carry out their dangerous work. His careful and tactical nature makes him an effective planner, and his reputation as the smartest man in Edo reflects his ability to think several steps ahead.

Within the story, Ooka serves as a supporting figure who coordinates and watches over the activities of the office charged with combating the insect threat. His most prominent involvement comes when the Mushibugyō, the head of the office, must journey to the Kishū well to recover her powers. Ooka is the samurai sent to protect her during this journey, traveling alongside her as she goes under the alias Kuroageha, as well as with Jinbei Tsukishima. This mission moves him out of his usual administrative role and places him directly in the field as a guardian and escort. During the journey, he remains watchful and disciplined, and he frequently disapproves of Jinbei's childish behavior, pointing it out with his familiar phrase whenever the young samurai's antics risk causing trouble for the group. His presence on the road shows that his sense of duty extends beyond giving orders from the office and includes sharing the dangers faced by those under his command.

Ooka's most important relationship is with Tokugawa Yoshimune, to whom he is steadfastly loyal. He also works closely with the Mushibugyō, whom he is entrusted to protect, and with Kuroageha during the journey to the Kishū well. His interactions with Jinbei Tsukishima form a notable contrast, as Jinbei's lighthearted and impulsive personality clashes with Ooka's seriousness; Ooka repeatedly corrects him but continues to guide him and keep the group focused on their objective. His role in this small traveling party establishes him as both an authority figure and a protector, even if he expresses his concern through criticism rather than warmth.

In terms of development, Ooka does not undergo dramatic personal change over the course of the story, remaining consistent in his composed and principled demeanor from beginning to end. The journey to the Kishū well, however, broadens his role from distant administrator to active field escort, demonstrating that his commitment to protecting Edo is practical as well as administrative. Through his repeated correction of Jinbei, he also shows a willingness to engage with and steer the younger generation of warriors, even when their methods differ from his own.

Ooka's notable abilities are intellectual rather than combative. He is widely regarded as the smartest man in Edo, with deep knowledge of city policy, governance, and strategy, and he is heavily involved in running the affairs of the city. His tactical and careful nature makes him an effective decision maker and overseer, and his calm judgment allows him to remain clearheaded in stressful situations. No remarkable fighting ability or supernatural power is attributed to him; instead, his strength lies in his intellect, his authority as a magistrate, and his unwavering dedication to the duty of keeping Edo safe.