Tarou Satonaka

Tarou Satonaka (Japanese: 里中 太郎 Hepburn: Satonaka Tarō) was a Japanese police detective sent to Europe to join an elite group of detectives called the Lupin Taskforce to track down and arrest Arsène Lupin. He is the father of Satonaka Ryunosuke and Robert Ryunosuke's grandfather.

Personality
Just like his grandson, Satonaka is very serious man. But opposite to his grandson's no nonsense aproach, Tarou isn't affraid to crack a joke once in a while. He is very polite to everyone he meets, especially to Sherlock Holmes, whom he has a lot of respect for. Unlike his grandson, he isn't very impulsive. He thinks everything through and is regarded as the greatest mastermind of the Japanese Emperial police force.

Relationships
Ryunosuke has a good relationship with his secretary, Shizuka Kurosaki. She treats him as a father figure and does everything he tells her to do. He treats her with a lot of respect and tries to learn her the essence of being a detective.

His relationship with Willacy Wakeman is very different from that of their respective grandsons.