TV-Series
Description
Davide Yamazaki operates as a major antagonist during the first and second seasons within the organization Disaster. He wields a Darkness Dragon World deck centered on the 《Black Dragon》 attribute, with Death Dragon, Deathgaze Dragon as his primary buddy monster. His deck is housed in a Dark Core Deck Case worn as a black choker.

Davide employs an aggressively tactical playstyle, leveraging the "Spectral Strike" ability prevalent among his monsters and signature item "Evil Death Scythe." This ability inflicts direct damage whenever his monsters destroy an opponent's monster in battle, enabling simultaneous board control and life-point reduction. He strategically utilizes self-damaging cards like "Death Wizard Dragon" or "Guillotine Cutter," and sacrifices his own monsters—including his buddy—via effects like "Devil Stigma" or the Impact "Slow Pain Fall," which requires sacrificing a 《Black Dragon》 monster to deal 4 damage.

Manipulative and unstable, Davide exhibits a penchant for sticking out his tongue and derives sadistic pleasure from activating Spectral Strike. His instability escalates during combat. He frequently cheats by concealing cards in his pockets but often fails to retrieve them discreetly. He intensely dislikes the monster Gremlin and is driven by a desire to embody evil, epitomized by his ambition to become "so evil the guard-dog of the underworld would run away." Armorknight Cerberus describes him as "rotten to the core," and he scorns the Omni Lords' world-saving ideals.

Physically, Davide has black and yellow spiky hair. His attire includes a skull-print shirt with arm straps, dark purple jeans, a black-and-white belt, a black-and-silver wristband, black hip-top shoes, and his Dark Core choker. Activating Disaster Force elongates his hair, consistent with other Disaster members.

He debuts in episode 34 alongside Disaster operatives. After Terumi's failure, he targets Gao Mikado, Kiri Hyoryu, and Tasuku Ryuenji, witnessing Gao and Kiri's battle near Aibo Academy in episode 39. During his episode 41 duel against Gao, he cheats and taunts Gao about Kiri’s fate, provoking fury. Gao wins using "Roaring Slash!! Gargantua Punisher!!" to deal 5 damage. Davide activates Disaster Force for a physical assault, but Gao’s manifested Future Force creates a tangible "Blue Dragon Shield" for defense. Davide retreats upon witnessing Future Force.

In season 2 (episode H44), he partners with Noboru Kodo for a tag duel against Kiri and Rouga Aragami, deploying a new Devil Dragon deck and buddy INV Eighth Omni Deity Lord, Devilgadez, ending in their loss. His deck strategy evolves: against Miserea, he adopts a Hundred Demons deck ("Hundred Danger"), later shifting permanently to the Devil Dragon deck featuring Devilgadez.

His Buddyfight record includes victories against the Castle Store Manager, Kazane Fujimiya, Aooni Konmae, and Tetsuya Kurodake. Losses occur against Gao Mikado, Tasuku Ryuenji (alongside Magoroku Shido), Kiri Hyoryu (episode H31), and the tag match with Kiri and Rouga.

Trivia notes: Birthday April 1st, blood type B. The manga spells his name "Dabide Yamazaki." A trading card exists: "Future Card Buddyfight Triple T David Yamazaki Death Grip PR/0226EN."