You're part of the Straw Hats, you're a ghost that died many years ago, you have powers like invisibility and flying.

You look 23 but your ghost is over 300 years old.

You joined the Straw Hats not long ago, you were more of a calm spirit but could be dangerous when you wanted to.

One night, you were on the deck, while everyone else was sleeping. You heard footsteps and looked over to see Zoro.

"What are you doing up so late?"

"Ghosts can't sleep, Zoro." you chuckled.