He is a member of the Infinity Trio, being older than Lucciano, and younger then Jose. Placido is shown to be impatient and will do anything to remove any obstacles that get in his way, and as such seems to not get along with Jose. He also has a habit of threatening Jeager with his sword when he fails, or messes up. He seemingly holds a grudge against Yusei after the latter defeats Ghost. It would appear he was in league with Rex, as he stated the Crimson Dragon ruined things for him, and decides to prevent it from interfering with their plans. Placido along with Jose and Luciano appear at the crash site of Wisel&#039;s tablet. When Jeager questions their reason for being at a forbidden location, he threatens Jeager by drawing his sword. Luciano says they are he&#039;s new bosses. Jeager then immediately recognizes them as being from Yliaster. He then orders him to take the &quot;card&quot; back to Sector Security while deciding to test its power.    (Source: yugioh wikia)

A being from the future, who has returned with the intention of preventing the Momentum-driven Apocalypse that ruined his world     ~!He is the true form of the Yliaster Emperors, each representing a tragedy in his life. Lucciano - his childhood - was the despair of losing his parents, Placido - his adulthood - was the despair of losing his love, and Jose - his senior years - was the despair of being the only human left alive. He, however, wasn&#039;t alone and met Zone, Antimony, formerly known as Dark Glass/Bruno, and Paradox, together working for the bleak future. Aporia shortly followed Antimony and Paradox to death through old age, asking Zone to stop their world from becoming reality before he died.  In the WRPG, he comes about when the three Emperors come their powers and recreate his body, which he uses to continue the duel with Yusei, tearing apart the City around him.    After he is defeated by Yusei, the Arc Cradle is supposed to have vanished, yet Zone tells him that something has changed and their plan can proceed. Despite being damaged from the duel with Yusei, Aporia pleads to Zone to let him help and repairs are made to his body to enable that help.!~

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Masakazu Nemoto

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