Alessi

Barely a foot taller than a typical child, Alessi is a tiny man who looks even smaller once Sethan's aging trick has been reversed and Jotaro and Polnareff tower over him. Strings of beads dangle beneath a strange, mop-like tangle of hair, easily his most memorable trait.

His baggy dress shirt hides the tools he favors: a bulky hatchet with the word Ax carved into it, paired with a silenced handgun.

Cruelty and cowardice sit side by side in Alessi, who picks only opponents he already outmatches. Humiliating and mocking a victim before the kill delights him, and he happily reaches for any dirty trick to tip things his way. Yet he guards a peculiar professional pride and will risk himself to punish anyone who embarrasses him.

He rationalizes his own creepiness through twisted logic, arguing that anyone who keeps calling himself weird cannot truly be weird, so by that reasoning he is normal. Fittingly, Sethan borrows its name from Set, the Egyptian storm god whom the ancients regarded as evil itself.

DIO recruits Alessi to kill Jotaro Kujo and the crew around him. He surfaces first while tormenting street children, then fixes on Polnareff walking alone; Sethan slips out like a shadow and reverts both Polnareff and Silver Chariot into kids. A woman who had befriended Polnareff is shrunk further into an unborn baby, and Alessi warns she will rot away unless he is dealt with fast.

Though young Polnareff cannot recall Jotaro or handle his Stand well, he still outfoxes and wounds the mercenary, who bolts as Jotaro shows up. Alessi even manages to de-age Jotaro, betting a newly awakened Stand user cannot answer back, but the boy hits like a truck and clubs him unconscious.

He wakes to find the aging gone, a teenage Jotaro beside a fully grown Polnareff. Star Platinum and Silver Chariot then pound him in one merciless combined assault, leaving him wrecked and finished as a fighter. What became of him is never confirmed, though the drop most likely proved fatal.