Marshall D. Teach, known as Blackbeard, serves as a central antagonist in the One Piece world. Born in Shade Port on the Grand Line and orphaned young, he belongs to a unique bloodline noted by figures like Jaygarcia Saturn and Catarina Devon. As a child, he was often found crying under the moonlight, hinting at early sorrow. Driven by a deep obsession, he sought the Yami Yami no Mi Devil Fruit for its power to nullify other Devil Fruit abilities. At age 12, Teach infiltrated the Whitebeard Pirates as an apprentice, hiding his true goal. He spent over twenty years with them, rising within the crew and engaging in clashes with the Roger Pirates, interacting with apprentices like Shanks and Buggy. He scarred Shanks and witnessed significant events, including Shiki's meeting with Whitebeard and the protection of Fish-Man Island. Despite opportunities, he consistently refused commander roles, claiming a lack of ambition. His betrayal erupted when Thatch, the 4th Division Commander, discovered the Yami Yami no Mi. Teach murdered Thatch, stole the fruit, and fled. He then formed the Blackbeard Pirates, recruiting Lafitte, Van Augur, Jesus Burgess, and Doc Q. The crew attacked the Drum Kingdom, forcing King Wapol to flee. Teach later encountered Monkey D. Luffy in Jaya, their contrasting personalities nearly sparking conflict. He spoke of pirates' endless dreams and attempted to capture Luffy for his bounty, but the Straw Hats escaped to Skypiea. On Banaro Island, Teach fought Portgas D. Ace, who sought vengeance for Thatch. Teach demonstrated the Yami Yami no Mi's power to absorb and crush matter, defeating Ace. He handed Ace to the Marines to become a Warlord of the Sea. This position enabled his infiltration of Impel Down, where he freed notorious Level 6 prisoners, forcing them to fight to the death and recruiting the strongest survivors, including Catarina Devon and Sanjuan Wolf. During the Marineford War, Teach killed the weakened Whitebeard and employed a mysterious method to steal his Gura Gura no Mi, becoming the only known wielder of two Devil Fruits. He resigned as a Warlord, declared himself an Emperor, and later conquered most of Whitebeard's territories in the Payback War. His bounty skyrocketed from zero to 3,996,000,000 berries. Post-timeskip, he established Hachinosu as his base, aiming to create the Blackbeard Kingdom. He targeted powerful Devil Fruits like Boa Hancock's Love-Love Fruit and Trafalgar Law's Op-Op Fruit, while also seeking Road Poneglyphs to reach Laugh Tale. In *One Piece: Stampede*, Teach participated in the Pirate Festival on Delta Island, competing against the Straw Hats and others for Gol D. Roger's treasure. He battled members of the Worst Generation but avoided direct confrontation with Douglas Bullet, prioritizing strategic opportunities over unnecessary fights, reflecting his opportunism. Teach embodies contradictions—courage mixed with cowardice, intelligence with recklessness. He values crew camaraderie, trading for a battleship to accommodate Sanjuan Wolf, yet displays ruthlessness, abandoning crewmates to petrification or brutalizing subordinates for failures. He fears death, begging Whitebeard for mercy, and holds a nihilistic worldview, rejecting concepts of justice or evil. His belief in fate and dreams mirrors other "D." carriers, though his methods involve betrayal and manipulation. Teach's appearance evolves visually, his beard splitting into sections post-timeskip. His laughter, marked by "Ze ha ha ha!", reflects his persona. Teach's connection to Rocks D. Xebec is implied through shared ambitions to become "King of the World" and his flagship's name, *Saber of Xebec*. Theories suggest his ability to wield multiple Devil Fruits stems from a unique body or inherited will, possibly linked to Rocks. This potential duality is reinforced when Luffy and Zoro once referred to him as "they". Teach stands as Luffy's antithesis, both pursuing the title of Pirate King but diverging fundamentally in ethos and action.