Let's be honest, Ivy and the other females in that game series and the DOA girls come from Japan.... where characters are all like this:
And need i even bring up the character Halibel from Bleach? If you aren't familiar just look it up, rather not post it as I could catch warning points for it.
I'm not trying to excuse it but I am saying it's not surprising coming from Japan. Look at the female characters from Uncharted which comes out of the States. Sure Chloe is a bit sexualized admittedly but both her and Elena are very competent (for the most part, Elena is still too damn compassionate in the second game).
If you want to joke about the marketing though this picture is hilarious even though I love the movie and the universe the movie is from:

I leave you with this for a laugh at the end of meandering and slightly rambling post:
