D.R.

D.R. is one of the main antagonists in Oda's one-shot, Monsters. It is mentioned that he is a third rate swordsman.

History
He bumps into Ryuuma and he stabs himself, claiming that Ryuuma did it. After this event he summons a dragon to destroy the village, claiming that Ryuuma challenged him to do it by stabbing him, but his original plan was to steal the villagers' precious items when they ran for their lives. Instead, after his partner Shirano was killed in one stroke by Ryuuma, D.R. begged the samurai for his life, under the claim that he is the only one capable of stopping the Dragon. His pleas fell on deaf ears as Ryuuma stabbed him to death.

Trivia

 * D.R.'s wanted poster that can be seen in Episode 45 of the anime on the wall on Fullbody's ship. Another poster can be seen in Episode 48 when Luffy goes to the Gold Roger Bar. The posters are crossed out, signifying D.R. is already captured (or in his case, confirmed dead), and that his bounty has been retracted.
 * For some reason, the wanted poster of D.R. in Movie 9 is not crossed out, despite his downfall many years ago.