It is about a crew of musicians. The Main character is the captain. A man with a sword on long the side of his back. With a handle of a cross, with dark skin, and white hair.
Main character name - Storm D Jackson.
Devil fruit- ?
Has all 3 haki. But won't be OP in the beginning maybe starting with observation haki.
Swordsman - same a Zoro at the beginning.
Plays guitar.