Shell King

Shell King is a massive creature crowned by a crab-like, insectoid head fitted with four eyes, antennae, and mandibles. In place of hands it wields enormous claws, and a spiked, hardened shell wraps its entire body above a cluster of crab-like limbs. The webcomic keeps the overall look but stands it on just two legs rather than a spread of crab legs, adding a tail closer to a lobster's.

Shell King has no real personality to speak of, driven instead by nothing more than raw animal instinct.

During the Neo Heroes Uprising Arc, Shell King first appears already engaging Blue, having wiped out the rest of his Neo Heroes team. It shrugs off Blue's opening attack but soon loses one of its claws, and its end comes when Blue unleashes his Fist Cannon, wiping the monster out entirely.

As a Demon-level being it is genuinely powerful, strong enough to beat Blue's squad even while they wore their battle suits, though not enough to touch Blue himself. Its hardened shell gives it heavy defense; the webcomic notes that its durability simply outstripped what the squad's suits could dish out. It caught an energy-charged hammer blow from Blue on its claw without serious harm, yet when he shaped his hands into a spear he sheared that claw clean off, and nothing about the shell could withstand the Fist Cannon that disintegrated it. Its strength was no less notable, sufficient to overwhelm a band of lower-ranked, battle-suited Neo Heroes.