Yusei Fudo is the main protagonist of Yu-Gi-Oh! 5D's, one of the Signers, and the current King of Duelists. He is known for and respected by many other characters in the show for his genius style of dueling, his considerable duel skill, and his cool and clever personality. He uses a Duel Runner called Yusei Go. In the English anime, "Let's rev it up!" is a common catchphrase that he uses.
Source from Wikipeida