Josuke being protective of Jolyne. Initially, it's more defensive, but then one of the dumb thugs says their hairstyles are stupid. You know what happens next.
The entire first encounter with Kira in Chapter 11, really.
This time around, Jotaro is beating Kira with his bare hands.
Ceasar taking charge of the situation and telling Josuke who to prioritize in terms of healing.
Jotaro using Star Platinum: The World Over Heaven to negate the bomb Kira planted on Aya Tsuji, directly saving her life.
Welcome to the SPW Foundation
The file on the Joestar Clan features multiple achievements listed for members of the clan as well as their honorary brothers:
Josuke and Girono graduated with Masters degrees in Anatomical Sciences and Biology, respectively. Jolyne is listed as a polyglot (aka she knows several languages).
Smokey Brown became a senator for the state of New York, moving up from being the mayor of New York City.
Okuyasu became a Master of Finances. Turns out his conservative attitude to handling money came in handy!