D-I-S-C-O is the last of the assassins sent by Valentine. He confronts Gyro, separating him from an injured Johnny, near Independence Hall, Philadelphia. He is a Stand user, wielding the gauntlet-like Chocolate Disco.
D-I-S-C-O is a tall slim man, with medium-length messy, curly dark hair with a large, rectangular hair clip/accessory sitting on the left side of his head. Shaved beard and mustache can be spotted around his face as well as blue eyes.
He wears a long coat similar to the ones worn by the police officers from the 18th century; wearing his Stand Chocolate Disco like an armband on his left forearm as well as wearing a handcuff for a belt.
D-I-S-C-O has a rather expressionless face and personality. He is very quiet and prefers to never speak more than is necessary, speaking only to reveal his Stand's name. During battle, D-I-S-C-O is cautious around his enemies, preferring to keep his distance away from them while using his Stand to transport hazardous objects on wherever they would go. When cornered, however, D-I-S-C-O loses his composure and immediately relies on his gun, which Gyro mocks him for.
- Main article: Chocolate Disco
D-I-S-C-O's Stand is Chocolate Disco. It can create a grid he may project over a limited space in front of him wherein he maintains virtually complete control.
In Philadelphia, as soon as the president manages to find the head of the corpse, he decides to take the last missing part from Diego Brando: the left eye. In order to do so, he ambushes Johnny Joestar and tricks Diego and Wekapipo using his Stand's power. While Valentine confronts them, D-I-S-C-O is sent to take care of Gyro Zeppeli in order to prevent him from helping Johnny and the others.
As Gyro reaches a corner of a building, Valentine and D-I-S-C-O surround him from both sides. Gyro spots D-I-S-C-O but hears gunshots; wanting to help Johnny, Gyro tells D-I-S-C-O to stand still and the agent complies, before activating his ability as soon as Gyro turns his head. With his Stand Chocolate Disco, D-I-S-C-O makes a grid appear on the ground. While Gyro is shocked to glimpse Wekapipo hiding near his horses, Gyro must focus on the enemy. He throws a Steel Ball at D-I-S-C-O, but it is then teleported above him and Gyro is hit by his own Ball. Gyro tries to run towards D-I-S-C-O, but the agent makes nails fall on Gyro, wounding his leg.
D-I-S-C-O then takes bottles of acid out of his pocket, intending to douse Gyro with the acid. Worried, Gyro throws his Steel Balls, but D-I-S-C-O teleports them again. However, this time, the Ball misses Gyro. Surprised, D-I-S-C-O attacks again but misses too with his nails and acid. Suddenly, a hand with a Steel Ball appears near him. Gyro reveals that he has created a zone of high pressure that refracts the light and prevents D-I-S-C-O from knowing Gyro's location. Desperate, D-I-S-C-O takes out a gun but the Neapolitan quickly knocks out the agent.
- Hirohiko Araki decided that D-I-S-C-O would not speak any more than necessary because of how in Perfume's song "Chocolate Disco" the title is repeated throughout the lyrics.
- D-I-S-C-O's name was originally spelled as Disco (ディスコ, Disuko) in the Ultra Jump serialization of Steel Ball Run. This was later changed in the tankobon release.