He always believed that his boss was the true leader of the Family and became quite sad after it was revealed he wasn't.
- His name is possibly derived from the word Boss.
- His name could also be derived from the Italian word mostro, which means "monster", or "monstrous".
- He gives the player the quest Family Business, Bad Luck Bostro and Family Nutritionist in London Life.
- While other Family members carry Thompson Sub-Machine Guns, Bostro carries what appears to be a single-shot grenade launcher.