User blog comment:Schizophrenic Psycho/Noah is Arlong's Brother/@comment-1908942-20101220010111

Barring the obvious relation (Also looks a bit like Shiliew, too oddly enough), I'd guess this guy was among the original Sunny Pirates, and a friend and someone who shared the same views as Arlong, but didn't want to go to the East Blue, and stayed with Jinbe's group, until they disbanded. But now that Fishman Island has lost Whitebeard's protection, this Fishman has now revived the group with the intent of killing any humans they can catch that come (I'm guessing so since Hammond and the other two seemed to have just been there probably on guard). Since the Neptune Army also probably are guards, and since the Mermaids weren't freaking out at the sight of Pirates or hiding in fear, I guess both groups have done a good job.

Don't know what he did in that break of the break-up and now, but I am sure we'll probably learn.