Yokomizo possessed a talent in writing mysteries given his vast expertise in the field of mysteries, knowing writing techniques like Knox's Ten Commandments and for locked rooms. As a result, he became quite famous as a mystery writer known by his pen name Kindaichi. He was also quite detail-oriented to a fault, ensuring that he did not repeat his past mystery storylines in his other works. He's 26 and is best friends with Mushitaro Oguri. Always calls Mushitaro "Mushi-kun"