A few minutes ago, Storm followed her down into the basement. She's 2.5 pounds, he's 11 pounds. He does one of those low crouch sprints over to her and hisses as loud as I've ever seen, and she looks at him and does this little hiss, and then runs for the stairwell. He runs after her, and rounds the corner, and she jumps down a couple steps in front of him and lands in front of his face, which freaked him out, and he ran up the stairs, and she ran up after him, blindingly fast -- the stairs are as tall as she is on her hind legs, and she just ripped up them after him! She's got a personality!
Right now, fascinated, but lots of hissing. It doesn't phase her though, she's doing that sideways lunge thing with all of them, and that was after being here for 1 hour!