Roderick of Staufen, the third prince of the island nation Eath, is both a childhood friend of Magnifico and the fiancé of Farnese. As a sailor, he envisions vast potential in exploring the seas, unlike his peers who focus internally to the point of stagnation. Roderick agreed to marry Farnese as part of Magnifico's plan to unite the Vandimion name with the royal family of Eath. His motivations for this arranged marriage include the significant opportunities and support the Vandimion name could offer him, but he also seems personally interested in Farnese due to her reputation.
Roderick has been used by the author to delve into Guts' deeper psyche by asking him questions about himself and Casca. Guts admires Roderick's naval prowess, evident during their fight against pirates. It remains unclear whether Roderick is in love with Farnese, but he does try to win her affection, even when it involves the delicate matter of her feelings for Guts.
With his long black ponytail, good looks, and devil-may-care attitude, Roderick is an excellent charmer and a decent swordsman. He demonstrates a willingness to fight demons, despite being ill-equipped for such battles. Currently, he is ferrying Guts and his companions aboard his ship, heading towards Skellig.
Roderick and his crew have earned fame on the high seas: His ship, the Sea Horse, single-handedly downed five Tudor vessels, earning Roderick the title of "Prince of the Seas." He and Isidro share similar thoughts when in the presence of women.
