Killer Giant

One of Gol D. Roger's famous battles, according to the Loguetown filler episodes, involved Killer Giant, a rough man with a large sword who was known for killing hundreds of pirates and was described as a devil.

History
Roger defeated and killed Killer Giant in a short battle, leaving a fatal gash in Killer Giant's skull. In his dying breath, the man praised Roger and dubbed him 'Eternal Pirate'.

His cracked skull currently resides with Raoul, the owner of the Gold Roger Bar.