Kaoru Namikido

short black hair, parted on the right and shaved on the left;
deep-set eyes with pinpoint pupils;
While on duty, he wears the standard patrol uniform, which includes a black bomber jacket and high-top sneakers.

"Demon Blood Ultrasound" (official ability name unknown) is an ability of Kaoru Namikido
With it, Kaoru can generate ultrasonic waves by shaking a small vial filled with his own blood. This allows him to examine his surroundings in detail, determine the number of people, and the structure of nearby buildings.

A warm and kind character with a gentle and approachable demeanor, he acts as a patient mentor to Shiki Ichinose and his friends, teaching them about the Oni organization and the Oni way of life.
However, behind Kaoru's calm exterior lies a sharp mind and a caustic tongue.
anibase.net
Namikido is a reliable and friendly hero who, despite the shortcomings of his blood, willingly gives it to others for use.