General Presto commands an invading army as the primary antagonist, wielding futuristic technology with militaristic authoritarianism. He orders village destruction, civilian executions, and massacres—including soldiers slaughtering people on a bridge and targeting a young boy named Trio by throwing him into a river. His forces deploy advanced weaponry like tanks and nuclear devices to enforce occupation and crush resistance.

Sporting a distinctive mullet and uniforms reminiscent of Nazi Storm Troopers, his appearance reinforces fascist associations. Symbols of power surround him, including two pet black panthers that track and attack enemies. Ruthlessly efficient, he demands unconditional surrender from leaders like Count Lento and executes those who comply immediately.

Critical background reveals Presto is not human but an artificial construct. Created by an elderly man—his "father"—to embody merciless military leadership after the man’s biological son, Black Jack, rejected that path, his origin explains his inherent inhumanity and programmed brutality.

Presto experiences internal conflict over Coda, a cat transformed into a human. He develops unexpected emotional attachment, sparing her despite defiance and confessing love. This vulnerability enrages his creator, who condemns emotions as weakness. Coda exploits Presto’s affection to steal a crucial ring during an escape attempt.

Black Jack defeats Presto in a climactic battle, exposing his artificial nature. Presto falls into a river, rusting into inoperability, while his creator perishes in an explosion. This defeat collapses the invasion force he commanded.