The Panther is, at this point, only available to Kickstarter backers! It may be available as DLC at some point in the future. But, if you befriend someone who has a Panther in Fallen London, they may send you one of their pet’s Kittens, which can also be imported into Sunless Sea.
Not as such, I’m afraid - there are only a set number of Panthers, and they all belong to certain Kickstarter backers. Kittens can only be found two ways - through having a Panther, or through being sent one by someone else. But, if you post to the Adoption Agency thread with a polite request, and include the username of your Fallen London account that’s linked to your Sunless Sea game, I’m sure some will have a kitten you can adopt!
I’m pretty sure they can. I read on the forums that you raise Spoor to 3 using options on certain connection cards, leave her alone with her mate, and you’ll get 3-5 kittens when Time, the Healer comes.
Note that there are two possible results from playing with the kitten. One gives the quality, but the other does not.
When I first used the kitten, I had the story with a mirror, which is not the one that gives the quality. Only after seeing someone else mention that there were two results to playing did I go back and get the result which gives the metaquality.
This may be an odd question, I just got my Panther (hurrah) but ah how do I make it show up in Sunless Sea? I mean the email address I use for Sunless Sea is the same as I use for Fallen London but do I have to tell the two to talk to each other or something?