Ibara emerges as the primary antagonist of the Treasure Island arc, a former minister of the Petrification Kingdom who orchestrated a coup to usurp power. Descended from astronauts marooned on the island centuries prior, he uncovered the ancient petrification weapon Medusa and used it to turn the Great Leader, the realm’s rightful sovereign, to stone. When the Leader’s infant son Soyuz witnessed the act, Ibara sought to eliminate him, but the child narrowly escaped with a woman presumed to be his mother. To legitimize his rule, Ibara concealed the Leader’s petrified form and fabricated an ongoing dialogue with him, deceiving the populace into believing their true ruler still governed. His regime imposed harsh edicts to suppress dissent, banning technological innovation to stifle rebellion and forbidding citizens from departing the island. He forcibly recruited young women into a harem, stripping them of agency, and condemned dissenters to petrification—a torturous state where victims remained conscious yet immobile. Loyalty meant little to him; he petrified his devoted subordinate Kirisame when she challenged his authority and later ordered the indiscriminate petrification of every islander, including his own forces, to eradicate opposition. A shrewd strategist and physically formidable foe, Ibara wielded the Medusa with lethal precision, leveraging exceptional spatial awareness to angle its petrifying beams. He detected intruders through subtle anomalies—a displaced chair, shattered glass—and employed psychological warfare, deploying decoy weapons and exploiting adversaries’ emotional vulnerabilities. Though outmatched in combat by specialists like Mozu or Kirisame, his skills sufficed to overpower opponents such as Ginro, whom he mortally wounded in battle. Ibara’s utter absence of empathy defined his cruelty. He callously sacrificed Oarashi as bait to trigger Medusa’s island-wide petrification and reveled in others’ anguish, taunting Soyuz after his petrification and gleefully anticipating the torture of revived prisoners to extract revival fluid. Paranoia fueled his brutality, prompting swift, violent retaliation against any perceived threat to his power. His downfall came during a confrontation with Senku, whom he wounded and cornered. Confident in victory after petrifying nearly the entire population, Ibara underestimated Senku’s ingenuity. The scientist exploited Medusa’s activation mechanism, turning the weapon against its wielder and petrifying Ibara permanently. This defeat underscored the fatal flaws in his reign: overreliance on Medusa drained its power, rendering it inert, while his refusal to value allies left him isolated once his deceptions unraveled.