Guccio is a scrawny man with a triangular face, wide open eyes, a small flat nose, thin eyebrows, and a perpetually open mouth showing his teeth. Guccio sports a pencil mustache and a bowl cut, with two shoulder long strands of hair on each side of the head.
Guccio wears a long-sleeved shirt that expose his shoulders and midriff, and a pair of pants that similarly expose his hips. His pants have "SURVIVOR" written all over.
Guccio is a meek and cowardly man but somehow ended in the isolation ward. Sent as an assassin with no offensive power, the best he can do is beg for mercy when the Joestar Group finds him. Fights used to naturally break out around him, even though he wasn't responsible.
His bio indicates he was imprisoned for sexual assault (and theft), making him a pervert.
- Main article: Survivor
Guccio's Stand, Survivor, was given to him by Enrico Pucci. It can influence people's minds through small electric signals, causing them to become extremely aggressive. Those influenced by the stand begin fighting indiscriminately while also powered up. Guccio hides somewhere to avoid the mayhem.
While DIO had believed Pucci's Whitesnake to be superior for its stealing capabilities, he wondered if Pucci would betray him. The priest eventually confirms his loyalty, so DIO tells him the tale of a mountain lodger's Stand and how it drove men near him into a furious rage.
Coincidentally, Guccio also had the ability to cause people to fight since childhood. Fights would occur frequently around him, though he himself was never involved. After noticing Guccio's unfortunate ability, Pucci would later embed the mountain lodger's Stand into him in order to carry out his plans. Guccio's prison card reveals that he received a 5 year-sentence at some point for sexual assault and theft.
At one point, Whitesnake notices his tendency to make fights break out around him and endows him with the power of Survivor, which exacerbates aggressivity and thus is compatible with Guccio. Whitesnake instructs Guccio to let himself be brought to the punishment ward and let his Stand loose in order to assassinate Jolyne. The whole ward begins to fight among themselves and Guccio hides.
Introduced as a cowardly figure in the high security ward, Guccio starts out begging for Anasui, Jolyne and F.F. to help him leave after all the other prisoners are drowned and turned to plants. The group doubts his alignment, so after planting Diver Down into Guccio, Anasui directs him towards the exit. Guccio is stopped by D an G briefly, but triggers the trap inside Guccio, causing ribs burst from his chest and impale D an G in the arm. After injuring him, Guccio wanders off dilapidated and presumably dies.
His corpse is later found by Pucci after the birth of the Green Baby. To celebrate, Pucci inserts a symphony DISC into Guccio's head, causing him to play music much like a human stereo.