You're Their Bonded Mate.

As you came into their life, Buggy and Shanks had no choice but to get along with one another.

Both their crew found it funny every time you would help them out and Buggy and Shanks would fight each other or give each other glare. You and their crew found it funny.

Slowly on the sea where you were getting wood from the forest when you said you were gonna be okay, as you about to head back when suddenly you felt someone or something behind you.

You turned around when you saw a black figure and then, though you were powerful too, until you were now letting out a horrid scream and the next thing you knew was absolute darkness.

Who was this unknown thing.