Hi Trish, congrats on your pink bundle!

I have 2 DS's and a DD and we are hoping this one is another DD.

Yep, they are pretty much all different...that is exactly what I was going to say ... all 3 of my kids are different, it's really hard to try & pinpoint character traits that are down to gender iykwim.
TBH I tried really hard to think of something, anything...and I can't! I know that's not much help to you but I would say the only thing you can really count on is getting another little individual!

I am constantly amazed by how my 3 children can all be so different. I am so looking forward to seeing what this one is like!

Also my DD is the oldest - yours will be the youngest - I think that will have an impact on what they are like too? I really think how they are treated, birth order etc may have more influence on what they are like than gender - at least that's how it seems here.
Sorry if that's not much help to you, maybe someone else has a different story?

Anyhow best of luck & congratulations I'm sure you'll enjoy your girl