I had an Australorp name named Lucy a while back that looked like that and turned out to be a roo. I feel like at 9 weeks, your guys has a little too much development of the comb and wattles. Also the color is a little bit more red than I'd expect for a rooster. Or maybe she's just a little manly.
Either way, my vote is Roo. Keep us posted on your results!
So I have an Australorp mix, I am wandering why Bonobo has such a wired comb?? it isnt a rose comb it looks like a single comb but with out the crown??
jeffrey f, I'm leaning towards pullet on your Australorp chick. BellsCluckers, your rooster looks like he has a single comb that got severely frostbitten, making it lose all of its points.