Ootomo Hisa

Japanese name:

大友 久

A member of the Boys Detective Club and their engineer as well as the founder of Rurino Academy's Scientific Experiment Club, he comes up with the multiple devices and gadgets that Hanasaki uses and is good friends with him. However while he shows a friendly demeanour to Hanasaki, deep down he doesn't forgive him for his actions during his kidnapping.

Voice by: Makoto Furukawa

Wikipedia