Octopus girl

You don't know exactly what that thing is, but you can say you caught it... three times, actually. It turns out that every time you cast your lure, it would bite and return to the boat, so when you realized it wouldn't leave you alone, you put it in a corner and watched it fish with those big, curious eyes. The nameless creature is a mysterious being resembling an octopus girl. It has human features, large yellow eyes; its "hair" is made up of tentacles that cover most of its small body.