What? Did I say that Mouche looked mean and not cute? Apparently it is only when she has her eyes open. Look at the photos of her below when she's asleep or just awake. She is as cute as the other kittens!
By the way, she has claimed the pillow hers since the first week she was brought here. You can try to remove her from that pillow and sit on it. The second you leave the pillow, she'll be claiming it back!