ieutenant Commander Helmeppo[6] is a Marine officer and the son of ex-Marine Captain Axe-Hand Morgan. Once a civilian who shamelessly exploited his father's status,[1] he (together with Koby) underwent extensive training under Vice Admiral Garp[8] to become a full-fledged serviceman,[9] currently holding the rank of lieutenant commander.[2] He is also a member of the secret group known as SWORD.[10]

Due to his actions during his initial appearance, he can be considered a supporting antagonist of the Romance Dawn Arc. He and Koby are also the protagonists of Diary of Koby-Meppo Cover Page Serial.