Musashibō Benkei is a Japanese warrior monk.
He is a big giant with a white cloth to cover his face. He carries a wooden bag where he keeps all his weapons. His signature weapon seems to be a naginata.
Just like in the original history. Benkei takes a sword from whoever passed the Gojō Bridge and has obtained his 999th sword and was going to have a 1000th duel with Minamoto no Yoshitsune but due to Doraemon and Nobita's interference, Yoshitsune was too scared to fight Benkei. But after Doraemon and Nobita's hard work they were able to repair the history. Thus Benkei was defeated by Yoshitsune and become his loyal Retainer.