The Old man is: Byōjack
The brains, and vice-captain, of the World Pirates and older brother of Burndy. Using a network of all sorts of transponder snails, he has kept an eye on the information surrounding Burndy’s imprisonment and quickly relayed it on to the other crewmates when he escaped. He has a body that’s weak and fragile from sickness and sits on Burndy’s shoulder, and his fighting strength is practically inexistent.
The fish man is: Sébastian
One of World’s surviving crewmates. A Wotan (Half fishman and half giant) and from the Sebastiscus marmoratus fish species — thus his name. He plays the role of the gatekeeper/janitor/porter of the Growseade Lost his sight from all the battles he’s been in and wears sunglasses.
Tamago's brother is: Gairam
One of World’s surviving crewmate. He holds the_Cube Cube_ Devil Fruit and can make anything into a cube and stack it. He lived in hiding with the other members while Burndy was imprisoned and developed the Growseade (クローセアデ) (the ship). He is also the engineer of the left wing and fighter of the ship’s right wing.
The woman is: Naichin
One of World’s surviving crewmates. She is the female doctor and engineer of the ship’s left wing. She is a fighter oin her own right, and developed Kampou (eastern Medicine) Kempō fighting style with her attacks’ names coming from all sorts of medicine.If the effects of her medicine would wear out she’s return to looking like her real age…
source:http://onepiecepodcast.com/2014/08/17/3d2y-villain-burndy-world-designs-and-character-information-revealed/