Potentially a fishing related companion from the latest beta;
Right Click to summon and dismiss Bubbles.
So looks like it summons a companion called 'Bubbles'.
I had a feeling visiting Glassfin Village in The Jade Forest zone yesterday, that the fish in a bubble, which looks a likely candidate for this NPC would be made available. It can be seen in the Glassfin Village inn as a goldfish floating around in a bubble.
So perhaps a companion available this new faction, the 'Glassfin Jinyu', or via fishing (loot or reward)
I find the whole Glassfin Jinyu interesting. In their village there are some fishing by casting fishing nets which at least gives an in-game animation for this form of fishing. Also they 'farm fish' with underwater wooden cages around the waters edge. Possibly a way for players to 'farm' fish with The Anglers as we will be able to grow and harvest items in our own Farm with The Tillers.
It is not possible to reach The Anglers as that zone is blocked off to see if there are any similar set ups. Anyhow food for thought.