Kaoru Misuzaki is a supporting character in the Aldnoah.Zero television series. She is a soldier in the United Forces of Earth, holding the rank of Lieutenant Colonel. At the age of twenty-five, she serves as the executive officer, or vice-captain, of the assault landing ship Wadatsumi, which is part of the 4th Fleet Escort Force. In this capacity, she acts as the primary aide to her commanding officer, Captain Darzana Magbaredge. When the crew of the Wadatsumi later transfers to the captured Vers battleship Deucalion, Misuzaki continues to serve as its executive officer, demonstrating her consistent and trusted role within the ship's chain of command. She is occasionally entrusted to serve as acting captain when Magbaredge is absent.

In terms of personality, Misuzaki is characterized as a practical, capable, and calm individual. She possesses a logical and analytical mindset, and she is the type of person who clearly states her own opinions without hesitation. While this directness can be an asset in military operations, it is often perceived as overly blunt or tactless in personal interactions. Her thinking is also described as being defensive and safety-oriented, focusing on stability and risk avoidance. A notable and recurring character trait is her apparent difficulty with romantic relationships. This lack of success in matters of the heart is a source of frequent, good-natured teasing from Captain Magbaredge, who often chides Misuzaki by offering to explain the reasons for her unpopularity. Specific examples cited include her tendency to be too direct, to be late for appointments, and to focus excessively on safety, all of which Magbaredge humorously corrects as misguided romantic tactics.

As a motivated and dedicated officer, Misuzaki's primary drive is the successful execution of her duties aboard her vessel. Her role in the story is that of a reliable support figure. While not a primary combatant, she is a steady presence on the bridge, helping to manage the ship's operations and providing a sounding board for Captain Magbaredge. She participates in key missions, including the rescue and evacuation of refugees in the early stages of the conflict. Her competence is respected by her crewmates, and she is shown to be fully integrated into the team, even participating in informal moments like sharing meals and conversation with other female crew members. In the final epilogue, she is present for the ceremony activating the new Vers Empire's ship, confirming her survival through the war's end.

The most significant relationship in Misuzaki's life is with her captain, Darzana Magbaredge. Their rapport goes beyond a standard command hierarchy, displaying a familiar and even playful dynamic. Magbaredge frequently teases Misuzaki about her romantic failings, a recurring joke that defines much of their interaction. Despite this teasing, there is a clear foundation of deep mutual trust; Magbaredge relies on Misuzaki to command the ship in her stead, which she does effectively. Misuzaki also has professional interactions with other key characters, such as Ensign Inaho Kaizuka. In one instance, she directly asks him if he wishes to be removed from the front lines, showing her concern for the crew's well-being and the tactical implications of his unique Aldnoah activation factor. Another relationship, though less developed, is with the character Nina Klein, who at one point scolds Misuzaki for her choice of attire, further reinforcing the idea that her social choices are often subject to criticism.

Misuzaki experiences a modest but notable development throughout the series. While she remains a consistently capable officer, the running gag about her unpopularity serves as a form of character insight. It highlights a disconnect between her professional logic and the nuances of personal charm. Her personality is not portrayed as a flaw that needs fixing, but rather as a fundamental part of who she is. The show uses her as a source of grounded, deadpan humor against more dramatic events, and by the end, she remains a steady and unchanged presence, having proven her loyalty and competence without needing to alter her direct, analytical nature. Her primary ability lies in command and administration. Her notable abilities are not physical or combat-oriented but are instead her calmness under pressure, her logical decision-making, and her efficient management of shipboard duties. She is a competent military professional whose value lies in her reliability, her clear communication, and the trust she has earned from her superior officer.