Saint Roswald (Rosward Sei) is a member of the World Nobles and lives in the holy city of Mariejois. He has gained recognition for being the most responsible among his family, demonstrated by his reprimanding of his children's behavior.
According to his daughter, Shalulia, he has never beaten his own son Charloss, something that the Straw Hats did in their first day on the island. His wife(s) have yet to be seen.When Hancock speaks of her past, she identifies a man who was "the very vision of terror itself". The mans silhouette shows a hair-style that matches Roswalds family, however the only person in his family that matches the silhouette exactly is Roswald himself.
When his son was attacked by Luffy, he used his cane (which is a concealed rifle) and started shooting randomly around Luffy, then shouted out for someone to call for an Admiral. Sanji kicks the cane out of hand, followed by Usopp knocking him unconscious, after accidentally falling down from the rooftop and smashing his face into the floor".
Though he scolds his children he cares for them, has "never hit his son", despite his behaviour and showed deep anger at Luffy for hitting him. Like his daughter Shalulia, he has deep pride for his ancestry. Of his family, he is the only seen who didnt abuse anyone citizen or slave, though he shoots at the Straw Hat Pirates and supported the treatment that his children gave others.