According to the recent Vivre Card Databook – Vol.11, Jack the Drought is confirmed to be a full fishman (not half human), being a brindlebass fishman.
![](http://www.opfanpage.com/wp-content/uploads/2019/07/photo_2019-07-15_12-51-26-1024x723.jpg)
Because of this, even when falling into the water, while not being able to move due to his devil fruit, Jack is still able to breathe.
![](http://www.opfanpage.com/wp-content/uploads/2019/07/1212.png)
It is also confirmed his devil fruit being the Zou Zou no Mi, Model: Mammoth, an Ancient Zoan-type Devil Fruit, which allows the user to transform into a mammoth hybrid and full mammoth at will.
The full mammoth form granted by this fruit gives the user a massive frame, significantly increasing Jack’s already abnormal size. Jack can level buildings with a single swing of his trunk and leave imprints of his feet on the ground just by stepping on it.
![](http://www.opfanpage.com/wp-content/uploads/2019/07/Jack_vs_Inuarashi.png)
It is also revealed that Jack is 28 years old. At some point he joined the Beasts Pirates and a latter point, he was eventually promoted to All-Star.
![](http://www.opfanpage.com/wp-content/uploads/2019/07/47015400_329363301128629_4987507717095555072_n.jpg)
This seems to imply he didn’t found the crew with Kaido or something among those lines, though he was present 20 years ago at Wano when he was only 8 years old oddly enough.