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)

Yu-Gi-Oh! 5D's is set in Neo Domino City some time after the events concerning Yugi Mutou (DM) and Judai Yuki (GX). A new form of dueling, "Riding Duels", now take place on motorcycles called "D-Wheels". While regular dueling still exists, Riding Duels have become a popular form of entertainment for spectators, who watch them in specially-designed stadiums.

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An American actor and voice actor who has worked on several animated TV series, and was the voice of SEGA mascot Sonic the Hedgehog, as well as Shadow the Hedgehog and Jet the Hawk, in the Sonic the Hedgehog video game series, where he is credited as Jason Griffith, before the role was passed to Roger Craig Smith. 

(Source: Wikipedia)