Strong woman with red hair, look no further than the barbarian female.
More on topic...
I would have much more preferred that Diablo was much more muscular, akin to his previous incarnations.
Many have noted that his form is dictated by his vessel, yet as we've seen in Diablo I, he is still considerably bulky considering the fact that his vessel was a child.
The other oft-mentioned point is that Andariel plays a role in his appearance, yet there are five other male evils, three of which possess rather impressive mass.
So it's difficult to comprehend why three physically massive evils did not play a larger role in dictating his final size.
Factor in that Diablo himself is historically rather muscular despite his vessel's size (See: His possession of Prince Albrecht).
tl;dr. I wish Diablo was bulkier.