A friend sent me that post and this was the result.
Yukako Yamagishi - People often think her to be related to Josuke and she doesn't understand why. She refuses to believe there are any facial similarities. If not Josuke then Tomoko. Her stand is Bruford reincarnated.
Holly Joestar Kujo - Holly was a rebellious teenager: She was going around crashing cars, and dated a foreigner just to spite Joseph, only to actually fall in love with him. Holly has Hamon, but just like George 2nd she doesn't really use it. She has an overwhelming amount of physical strength, so she never needs help with shopping.
Tomoko Higashikata - Has a thing for older men, not interested in men her own age. Bonus if the guy is foreign. Her rage reminds the Morioh residents of Yukako. (I just really love the twins au). She's the hottest woman at her workplace.
Shizuka Joestar - She grows up having the same personality as Suzy Q, but has the wit and quick thinking of Joseph. She's been taught how to use hamon since Joseph had to halt his own ageing process when raising her.
Santana - He was a teenager when he woke up from him slumber. He finds a way to escape the Speedwagon foundation. He has a lot of internalised inferiority due to the treatment he experienced under Kars and Esidisi, and the constant comparison to Wamuu. He gets annoyed easily.
Narciso Anasui - He's also on the spectrum. Has a tendency to take things apart, and his intentions are often misread, which puts him in a sticky limelight. He has a hard time understanding why certain things are wrong (like creepy behaviour that was intended as romantic gestures). Picks and chooses when he wants to feel the weather. Doesn't like the rain's wetness, so he'll wear a hat. Definitely explains his fashion sense.