Firo Prochainezo
, フィーロ・プロシェンツォ
The youngest member of the Martillo family has exceptional fighting abilities. At ten years old, he lost his parents and was rescued by the head of the Martillo family following a failed robbery attempt. In this household, he is assigned to oversee casinos in order to prevent fraudulent activities. Eventually, he rises through the ranks and assumes management responsibilities within the family.
Spoilers:
In 1930, he mistakes the immortality elixir for alcohol and takes it. He later distributes the elixir at a party, becoming immortal himself. That year
