Mad Hatters

The Mad Hatters (マッドハッター, Maddohattā), is a name referring to the two Super Rookie Captains, Umori Kenshiro and Mauricio Kerrim, that rose to prominence during the events of Roman Numerals. They are considered to be the Super Rookie pirates leading the generation following the one lead by the Horsemen. Coincidentally, they acquired notoriety and world-wide fame just a few days after the Horsemen's deaths.

Overview
Kenshiro and Kerrim garnered massive attention from the media after their shocking attack on Aurora, an archipelago controlled by the Xros Pirates's strongest affiliates, the Numerals. Such attack was led by another rookie, Dragon D. Dexter, albeit one that had sailed for quite longer than Kenshiro and Kerrim at the time.

During this attack, both young Captains proved their incredible battle prowess by forcing the veteran pirates into a corner, and subsequently leading to the destruction of their controlled territories. Not only were the mostly unknown pirates recognized as incredible threats, but they proved they also led incredibly powerful fighters under their respective banners.

Seemingly appearing out of nowhere, the media is slowly gaining knowledge of each of the Mad Hatter's backgrounds, which would explain their impressive "debut" performance against such powerful opponents.

Differently from the Horsemen, the Mad Hatters lead their own crews composed of fighters that were also capable of going against the Xros Pirates. And interestingly enough, even while still being rookie pirates, they are believed to be incredibly influential in the Underworld, having close ties to large organizations and trades.