Mizuta Madaisuki was the older of the two Mizuta Twins, identical twin brothers of the Rumbar Pirates. He and his brother, Mawaritosuki, were identified by Oda in a SBS question. A fan asked why one of the Rumbar Pirates that died singing had a sword in his skull. Oda explained that this was because they were two identical pirates who died two separate ways.

(Source: One Piece Wiki)