@Fire Fist:
bangs head against the wall Rockstar. Rockstar. The guy's name is ROCKSTAR. And he's frickin EMO. He's perfect for the musician role.
I can see him wielding a guitar that ate the Eika Eika no Mi (Song Song Fruit). So it'd be a singing guitar, much like the singing sword of legend.
You know, there is some point to this. Rockstar, aside from the listed reasons, already has a sizeable bounty. I.E, as he'll most likly be the last member to join the crew, we won't have to wait for him to get a bounty.
Then again, I'd still like to see a mer/fish person join…