Rokki

Towering on the scale of an ancient giant, Rokki shares the colossal frame of his fellow Numbers. He is bald yet thick with body hair across his chest, arms, and legs, with stubble above his lip and a pair of dark horns rising straight from his head. Tattoos cover much of him, among them a spiral around his skull, the formal kanji for six on his brow, and crown-like markings on each arm. Dark overalls are his only garment, shielding his midsection while baring most of his chest. The anime leaves off the tattoos on his shoulders.

Tasked with watching over the armory's entrance, Rokki took the duty seriously enough that Yamato expected a fight to slip past him. Even so, he managed to doze off at his post while a full battle raged overhead. Mirroring the rest of the Numbers, he carries a signature laugh tied to his name, Rorokiki, and let out a Rokya sound when Fuga struck him.

More than twenty years before the present, Rokki was one of the test subjects in a Punk Hazard project aiming to artificially reproduce the ancient giants. The work failed, but Kaidou recruited the surviving subjects, who settled on Onigashima, joined the Beasts Pirates, and became the unit known as the Numbers. In the lead-up to the Fire Festival, the Numbers crossed into Hakumai through Mogura Port and traveled toward Onigashima alongside Scratchmen Apoo.

On the festival night, Rokki took up his guard position at the armory gate and drifted to sleep there. Acting on Yamato's instructions, fellow Number Fuga rammed him, smashing the gate open in the process and pinning him down so that Yamato could slip inside. His own combat abilities have never been demonstrated, though his nature as a manufactured ancient giant suggests immense strength, and he carries a morning star club he has not yet been seen to swing.