Jojo's wonderful adventure: Why does Diego have two bodies, body double?

The remains will trigger an initial physical body double, and everyone is different.

Double your body to grow up. When he grows up, he will lose his body, but still keep it twice as big. In the parallel world, the dragon Dior does not necessarily rely on the remains to wake up the twin, but there may be other props or self-awakening to trigger the twin. At first, body double just said that he lent his car to someone. Someone took a car to transport and made money to buy his own car. After returning the car, he can continue to use his own car for transportation. Jerome is the kind who has a job and doesn't have much time to drive. He had to walk after returning the car.

Jojo's wonderful adventure introduction;

The time is 1987, 50 years have passed since the death war between Joseph Joesta and "Pillar Man" ... Yue Se came to Japan to help his grandson Kujo Jotaro who was possessed by demons. It turned out that it was not an evil spirit but a ripple (double body). Body double's sudden appearance is due to the taboo karma between DIO, a vampire who woke up from a long sleep spanning 100 years, and Josta's family. In order to save Holly, the mother of Nobutaro, who was caught in Dior's spell, they decided to overthrow Dior, the evil incarnation, and set out on a journey with their partners.

The second half (Egypt):

Under the influence of the resurrection of Josta's sworn enemy Dior, a young man named Kujo Jotaro acquired the ability named "Youbo (body double)". In order to save Indio's curse, the fallen mothers Holly and Kujo Jotaro, together with their grandfather Joseph and their partners, embarked on a journey to overthrow Dior. During the long journey, Nobutaro and others fought off assassins again and again, and finally arrived in Egypt where Dior was located. However, in order to stop them from advancing, a new wave of strange and terrible enemy shadows is approaching.