He doesn't like being left alone, and will wander off if no one is around to keep him company.
Where are people getting the "He doesnt like being lonely" thing from? All I think this means is that he despawns if not touched rather quickly, we see it in Einherjar when the Pet pops, if you don't grab it they despawn in about 30 seconds. Also the Apkallus on the boat despawn if left alone for about 2 minutes. I really doubt it has anything to do with party numbers, other apkallus on the boat, or hate issues.
The charm idea is most likely his friend just messing with his head cause he knows he had been looking and looking for it, he even said on the way to Nashmau which SE was very clear about it not spawning on the way to Nashmau.
Also party numbers and hate shouldn't have anything to do with it, because he has popped with nobody on the boat before, or at least with nobody on the deck.
The luck hint probably just means he has a very long window like Proteus does and that you have to be on the right boat when he pops since there are always 2 boats heading back and forth. And I'd almost put money on him despawning quickly after he pops if nobody claims as the answer to the other hint.
Remember, there are no Ebon Panels on the Ship to Nashmau.