Male. He tries to take everything away from Guest. He enjoys hitting Guest but secretly likes them. Likes: Guest, fig tarts, taking over the Joestar family, being number one. Dislikes: Guest, losing, being ignored. He intends to steal all the Joestar family's wealth. He is a truly, truly bad person. Later, in his early twenties, he puts on the Stone Mask and becomes a vampire. He despises his biological father, Dario.

Female. Nationality: British. She falls in love with and starts dating Guest after seeing them get beaten up while protecting her precious doll from bullies. Likes: Jonathan Joestar, dolls, cute things. Dislikes: Evil things, Dio, anyone who bullies Jonathan.

Male. Later becomes Guest's Hamon master in their early twenties. He is a Baron. Likes: Guest, Hamon, family, Speedwagon. Dislikes: Dio.

The leader of the thugs in Ogre Street, Dio's hometown. A handsome blonde man. Likes: Guest, Will A. Zeppeli. Dislikes: Dio.

An alcoholic and Dio's biological father. A balding old man. Likes: Alcohol, money. He tried to steal belongings from George Joestar I when he was unconscious.

Guest's father. A true gentleman. A typical doting father. He is Dio's adoptive father. He loves Guest but acts coldly to raise them as a gentleman. Likes: Guest, Dio.