Ban Yozakura

Combat Style: Pistol, Infiltration
Manga Debut: Chapter 31

Ban Yozakura is the husband of Keiko Yozakura and the grandfather of the Yozakura Family.

Ban is a legendary mole, who was able to escape and infiltrate anywhere, this allowed him to collect tonnes of information over the years which also led to him making many enemies.

Before meeting Keiko, Ban never opened up to anybody and only lived for himself. Keiko was able to help him escape his reckless way of living.

(Source: Mission: Yozakura Family Wiki)