Debt Collector

Debt Collector (real name unknown) was a yakuza leader, who took young Denji after his father's death and forced him into paying off his debt. He was also the beloved grandfather of Katana Man. He was the main antagonist of the Introduction arc. He is very cruel and uncaring and does not care about hurting, abusing or killing even children. He seems to only be kind to close associates such as family members.