Ron Kamonohashi

Ron is a talented detective and the student with the highest grades in Detective Training Academy BLUE's history. As his detective license was revoked after an incident five years ago, he has partnered up with Totomaru Isshiki to still be able to solve cases.

[Spoiler] He is a sixth-generation descendant of Sherlock Holmes and a ninth-generation descendant of James Moriarty as well. [/Spoiler]

(Source: Ron Kamonohashi: Deranged Detective Wiki)