Onigumo

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A Marine officer who commands a fleet arriving at Marineford ahead of the Whitebeard war. Named on-page when his ship hails the fortress — “MARINEFORD! Prepare to open the gates! This is Onigumo!” (Ch. 542, p. 2). Not clearly depicted in this chapter (only the fleet / fortress are shown), so first_appearance is left blank until a panel shows him.

Arc-by-arc updates

Summit War — Marineford fleet hail (Ch. 542) — named, not shown

• His fleet reaches Marineford ahead of the war and hails the fortress to open the gates — “This is Onigumo!” (p. 2). Only the fleet/fortress are on-panel; Onigumo himself is not clearly depicted.

Notes

• Etymology : オニグモ / 鬼蜘蛛 “Onigumo” = the Japanese name for the orb-weaver spider (Araneus ventricosus); by kanji “demon/ogre spider” (鬼 oni + 蜘蛛 kumo). Confidence high (Fandom Trivia).
• first_appearance left blank — named in a fleet-hail at Marineford (@0542), not clearly shown on-panel.