Alessi

Alessi (sometimes translated as Alessy) is a minor character featured in Part III: Stardust Crusaders. He is portrayed as an antagonist.

Personality
Alessi is characterized as a sadistic, yet cowardly man who will only fight those who are weaker than him because he knows he can win. His most telltale characteristic is his bizarre hairstyle, which resembles a dust mop with decorative beads tied to it in intervals. He also carries an oversized hatchet with him that is engraved with the word 'Ax'.

Synopsis
Alessi is an assassin hired by Dio Brando to kill Jotaro Kujo and his friends.

Sethan extends from Alessi like a shadow, and proves to be a formidable nuisance to Jean Pierre Polnareff, easily allowing Alessi to hunt him until the de-aged Jotaro is finally able to punch an unguarded Alessi in the face several times, knocking him out cold.

Alessi has not been seen in the series again thus far and it is unknown what happened to him after being defeated by the protagonists. According to the parting message in his final chapter he, "...was punched into oblivion and cannot fight anymore."

JoJo's Bizzare Adventure (Arcade/PS1/Dreamcast)
Alessi is characterized as a comic-relief character (such as Dan from the Street Fighter) with his ridiculous animations and over the top attacks, but is in fact a powerful character. His active stand possesses incredible range, and can be extended even further by holding the Summon button down while calling it out. It's weakness however: Alessi will not be able to attack aerially with it active since Sethan is a shadow, and cannot leave the ground.

Alessi's Tendum ability allows him to move and attack a very rapid pace for a short period of time at the cost of an energy meter, and even chain it with another of his Super Abilities, Ushi-Ushi-Ushi, which makes Sethan rise from the ground and cause area of effect damage to the opponent. After any of his supers successfully connecting, (excluding Tendum without chaining it to a de-aging attack) his opponent will be shortly turned into a child (or something much more hilarious, such as Rubber Soul being morphed into a portly woman) and rendered defenseless against the onslaught of Alessi's 'Ax'. All of this makes Alessi a potentially deadly opponent in the right hands, and nothing to shrug off. Also he can shoot the opponet up to six or seven times with a gun he pulls out. His normal punch/kick attacks are weak but with Sethan he gets a boost of not having weak attacks.

The ability of turning someone into a child doesn't work for everyone, however, since most people either turn younger or turn to characters in the story such as Mariah who turns to the old woman in Egypt that Joseph encounters, or Khan and Chaka who respectfully turn to the kid and the cow that Anubis possesses before going into the river and Joseph turning to his younger self back in Battle Tendency although the younger Joseph  turns to a child with a superman comic.