Kaoru Tsubaki is the Physical Education teacher in the cram school. Often referred to as "Ol' Sideburns" by his students, he is well known to abruptly cancel and/or leave class upon receiving a call from a woman he calls "Kitten".
Tsubaki has a very well defined chin, thick eyebrows, and very large sideburns on either side of his head, hence his nickname "Ol' Sideburns". He has short, brown hair and wears the standard Exorcist teacher's uniform.
He is a hyperactive teacher that voices opinions rather quickly. He is also always there for his "kitten" / "honey" (His lover/wife). She seems to be Tsubaki's top priority, as he abandons his job often when she needs him.
He is shown to be protective over his students and truly cares for them. Although not often seen in the beginning, Tsubaki puts his life and title on the line by assisting the students in saving Rin from Ernst and later pushes Suguro away from Satan's attack with his deadly blue fire, causing him to be engulfed by flames (but is saved by Kamiki. He is a truly caring person and puts others' safety above his own.
True Cross Academy arc
He appears first as the Cram Class' P.E teacher. He scolds Rin and Ryuji for trying to treat the lesson as a race when being chased by chained Reapers. When he receives a call from a woman whom he addresses as "Kitty", he cancels the P.E class and leaves. Before he left, he warned the class not to do anything funny or play with the Reapers without a teacher or himself around.
Meister & Abilities
Spectral Awareness: As he is an Exorcist, Kaoru had to perform the Mashō Rite, thereby allowing him to see Demons.
- Tsubaki owns a heavy motorbike and rides it with a leather vest and matching helmet and sunglasses.
- (On the Phone) "What is it, honey?"
- "Wait for me my kitty!"