When does baby's personality really start to show? Isabelle is almost six months and I feel like she doesn't really show…

When does baby's personality really start to show? Isabelle is almost six months and I feel like she doesn't really show much personality other than the fact that she's SUPER rough on everything. She likes to bang around, hit, throw, squeal, kick, etc. She's not gentle at all. When she's around other babies, she doesn't seem to pay them any mind. She doesn't have any particularly weird quirks...it's like her personality is still that of a newborn.