Debt Collector

Mob Boss (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.

Appearance
He is an elderly man with a scruffy grey beard and mustache. He wears a hat, suit and glasses.

Personality
He is very cruel and uncaring and does not care about hurting, abusing or killing even children. He seems to be only kind to close associates such as family members.