TV-Series
Description
Kaoru Tsubaki is a supporting character in the Blue Exorcist: Kyoto Saga. He serves as the physical education instructor at True Cross Academy and holds the rank of Exorcist, though his specific Meister qualifications are not disclosed.

Tsubaki is a man of distinctive appearance, easily identified by his pronounced jawline, thick eyebrows, and notably long sideburns that extend down both sides of his face, earning him the nickname Old Sideburns from some students. He has short brown hair and typically wears the standard uniform of an Exorcist instructor.

In terms of personality, Tsubaki is a hyperactive teacher who expresses his opinions quickly and directly. He is known among the student body as an instructor who is the most likely to inadvertently reveal information, making him a useful source of gossip when the Exwire class seeks answers about changes at the academy. A defining and eccentric quirk of his character is his tendency to abruptly cancel or leave his own classes upon receiving a phone call from a woman he affectionately addresses as my kitten or my darling. These calls take absolute priority for him, and he does not hesitate to dismiss his students to attend to her needs, giving the strong impression that she is the most important figure in his life.

Within the story's progression, Tsubaki is first seen by the main characters when he is informed by Mephisto Pheles about Rin Okumura's demonic heritage. As a teacher, he supervises physical training exercises, which often involve students being pursued by Leapers to help them acclimate to demon movements. During one such session, he intervenes to stop a fight between Rin Okumura and Ryuji Suguro, later reprimanding Ryuji privately about Rin being a special student who requires different handling.

His professional role extends beyond simple instruction, as he appears as one of the teachers inspecting examinations to judge candidates for promotion to Exwire. He also serves alongside Yukio Okumura as a supervising instructor during missions, such as when Rin's class is assigned to capture a ghost, where he quizzes the students on their theoretical knowledge.

Regarding key relationships, Tsubaki interacts primarily with the students under his charge, particularly the main group including Rin Okumura and Ryuji Suguro. His professional relationship with his colleagues is implied through his inclusion on examination boards and mission oversight. The most significant personal relationship depicted is with the unnamed woman who calls him, though her identity remains unspecified.

There is limited observable development for Tsubaki within the narrative presented. As a faculty member, his function remains relatively consistent: providing supervision, conducting training, and serving as an authority figure within the academy. However, a notable detail about his resilience emerges from an event where he demonstrates the ability to maintain his consciousness even after being possessed by Satan, indicating a level of mental fortitude despite the absence of displayed combat abilities.

Regarding notable abilities, Tsubaki has not been shown actively employing exorcism techniques in a combat scenario, and his Meister type is unrevealed. Beyond his teaching duties, he is known to own a heavy motorcycle, which he rides while wearing a leather jacket, a matching helmet, and sunglasses. His most demonstrated skill is his physical resilience and his capacity to endure supernatural influence while retaining awareness.