As someone who spends a lot of time alone with an animal, let me say that Lucretia definitely got in the habit of talking to the Voidfish during her year alone. Sometimes if the Voidfish wasn’t in the room she would forget and just kind of talk to an imaginary Voidfish.
Sometimes they had coherant conversations! Fisher is a smart jellyfish. Sometimes it was more like;
Lucretia: *drops something* See, this is why we can’t have nice things. Because everything is garbage and we’re all going to die.
Fisher: *worried jellyfish noises*
Lucretia: I know, buddy. I want to die too. But we can’t, can we? Because then a giant disc of living darkness would eat all of existence unstopped. And that would be bad.
Lucretia: That’s a fair point. I guess we can not die for today. Do you want to find some stories to eat? Goodness knows the locals won’t be using them in a year or so.
After a few months of isolation it got the point where they’d shout at each other across the ship just to have company. Fisher would blare random music notes and Lucretia would yell back something inane like “Yes, I know” or “I’m on it, Captain!” The Voidfish would follow her around the ship and make noise at her, because it realized how lonely she was, and she would have very serious conversations about the fuselage and the engine and her past and anything else that came to mind with this bouncing, growing (constantly curious, way too rambunctious) fish.
When everyone else got back they were a little concerned about the way Lucretia kept turning to the Voidfish and randomly saying things like, “If we don’t find something to eat other than transmutated tree bark things I’m going to stage a mutiny and throw everyone in the brig. First I’ll make them build us a brig,” or ask it about its thoughts on religion and the Hunger as a representation of internal emptiness and external consumption. Worse, sometimes the Voidfish would respond in what sounded suspiciously like musical sentences, leaving everyone with the unsettling impression that the still very tiny, baby Voidfish deserved contributing editor status on Lucretia’s journals now.