Dela Rossa, Oscar Joaquin

Yasutora Sado's grandfather. He seems to be a fairly strong elderly man, yet possesses a gentle nature. Following the death of Chad's parents, Sado relocates to Mexico with Oscar Joaquín, who adopts and raises him. Chad addresses him as "Abuelo" (Spanish for Grandfather).
In his early years, Chad was extremely violent; leveraging his size advantage, he intimidated and struck any other children who annoyed him. Oscar Joaquín attempted to teach Chad gentleness, but was initially unsuccessful. One day, the fathers of the children Chad had fought, seeking to punish him, attacked Chad. Oscar Joaquín intervened, taking Chad's punishment without retaliation. Chad was inspired by this example to become a decent person. Afterwards, Oscar Joaquín gave Chad a Mexican coin. The coin was minted sometime between 1823 and 1909, and features the words "Republica Mexicana" (Mexican Republic) engraved on it, along with the Mexican National Emblem. The monetary reform of 1905 minted Mexican coins with the words, "Estados Unidos Mexicanos'," which are seen on the Mexican peso today.
Years later, after Oscar Joaquín had died, Chad made a vow that he would never fight unless it was to protect others, as instructed, even if his own life was in danger. The coin would come to symbolize this vow, which Chad now claims to hold more value than his own life.
When Abuelo died, Chad decided to return to Japan.