Misty is lovely, she looks a lot like my cat, Tina. I seem to develop instant love for cats that look like mine, haha.
Having owned cats my entire life (32 years!), I know how tough it is to lose one of them. I'm really sorry for your loss, and hope Misty helps to fill the empty spot left...
I'm not a cat expert, but since my house seems to accumulate strays, I have some experience with introducing cats to each other.
I think there's still hope. One of our cats, Domino, is very territorial. When I adopted Bandit, he and Domino just hated each other right away. Over time...
Domino's eye didn't start out brown, but slowly turned brown over several years. It's been fully darkened for 5 or more years now. I can't remember what the vet said is causing it (it's been a long time since we had him in specifically to have his eye examined). It's also really hard to tell...
I've grown up with cats, and I just love them so much. We currently have 5 kitties. As with all kitties, each comes with their own personality. I hope you don't mind me introducing my brood!
Muffin:
Muffin is very skittish and prone to freaking out randomly. She's about 10 years old now...