A timid English boy from Phantom Blood, Poco is first sent out as mind-controlled bait against Jonathan by Dio Brando. Freed of that control, he joins the Joestar Group's march on Dio's castle, driven above all by the wish to rescue his captured sister.
Poco is a small British lad, short as befits his age, with a scatter of freckles and short wavy hair. He goes about in a plain light shirt and overalls, and keeps his feet bare.
At first Poco comes across as a sly little coward who pilfers the group's supplies. His braver side surfaces later, above all as Jonathan struggles against Tarkus, when the boy proves ready to gamble his life for the others. Throughout it all, worry for his sister, held captive by Dio, weighs on him.
Poco grew up an easy target for bullies, shielded again and again by his older sister. When she pressed him over when he would finally stand up for himself, he answered "tomorrow" and earned a slap for it. During Dio's stay in Windknight's Lot, the boy was brainwashed into luring Jonathan into a trap.
On the road to the castle he first appears as a pickpocket lifting the group's belongings, though he is acting under Dio's control; slipping away quickly, he soon finds himself menaced by zombies and is rescued by Jonathan, coming to grasp the gravity of the group's plight. As Jonathan loses ground against Tarkus, Poco at last summons his courage, risking himself to open the door so Zeppeli and Speedwagon can reach him. He then follows the group into the fight against Dio to free his sister, kept safe by Straizo during the battle. Once it is over, he turns up alongside her and the others at the port to send Jonathan and Erina off on their honeymoon.

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Poco is a timid English boy in Phantom Blood who is initially brainwashed by Dio Brando into ambushing Jonathan Joestar. After breaking free of that control, he joins the Joestar Group's assault on Dio's castle to rescue his captured sister, showing genuine courage along the way.
No, Poco is a boy, not a girl. He is a small English lad in Phantom Blood, the younger brother of Poco's Sister.
Dio Brando kidnapped Poco's sister and held her captive in his castle. Struck by her age and beauty, he tried to seduce her with promises of eternal youth, but she refused and slapped him.
When Jonathan Joestar struggles against the villain Tarkus, Poco summons his courage and risks his life to open a locked door so that Zeppeli and Speedwagon can reach Jonathan in time.
At the start of the story, Poco comes across as a sly, cowardly boy who steals supplies from the Joestar Group. His braver side emerges later, and worry for his captured sister weighs on him throughout the journey.
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