Illuso is a minor antagonist in Part V: Vento Aureo.

Illuso is a member of La Squadra di Esecuzione, confronting a section of Buccellati's Gang in Rome.

Illuso is cocky, however his bark has a bite. He is one of the strongest members of La Squadra, almost killing 3 of the main characters with extreme ease. His downfall was his lack of knowledge on Giorno's Stand.

Illuso possess the stand "Man in the Mirror." His stand has very mediocre stats, however it's main ability picks up the slack (When talking about stats I’m mainly talking about his C in Destructive Power and D in Durability).

Man in the Mirror's main ability is his "Mirror World." This is the land of the dead, basically meaning there is no life inside the "Mirror World." The only exception to this is when Illuso enters the "Mirror World" or pulls someone in to the Mirror World.

Unsurprisingly Illuso enters the "Mirror World" through mirrors or any reflective surface, however that hasn't been seen in the series. Breaking the mirror will give him more opportunities to enter and attack because of the more angles that are available because of the mirror's fragments.

When Illuso is targeting a person to drag into the mirror world, the target is able to see him in the mirror; however, the target is the only one able to see him in to mirror. This process can't be stopped unless canceled by Illuso. When the target is pulled into the "Mirror World" all of their possessions are turned into spiritual energy. The stand of the user is also left outside of the "Mirror World" making them defenseless to Man in the Mirror's attacks. (Correction: Illuso can drag stands into the "Mirror World," but they have to be his target, in turn leaving the user in the real world.)

Inside of the "Mirror World" all damage made in the real world is mirrored into the "Mirror World." Example: Someone Breaks a wall in the Real World => The same wall breaks in the Mirror World

Man in the Mirror's ability disables if the user is killed.

Man in the Mirror is based on the Michael Jackson song with the same name.

(Source: JJBA Wikia, edited)