Giorno:
step-dad is a piece of shit, only eventually behaves because a mafioso threatened him
DIO is a piece of shit, was never there for him
Johnathan couldn't be there for him
Giorno's mom is the kind of woman that fucks a vampire head using the corpse of his step-brother as body and also a piece of shit italian
The mafioso was more like a godfather than father figure to him.
Also, I almost forgot
Live in mafia controlled, drug ridden, 90s Italy
Only befriends soldiers, a mafia capo, a mafia boss' daughter and a cripple - most die or become a turtle
Josuke:
lived in Japan at it's best years for a male teen
Albeit being the child of an affair, Joseph is his biological father
Had his grandfather, a police officer, as father figure until high-school
His mom is a good woman, they live in a big house - he even plays video-games there
Pretty much all his friends are good people (minus the mangaka) - he's so nice that he even befriends an alien