He is a captain of the army's cavalry. When Funny Valentine was a child, Captain Valentine tells Funny about his biological father, and teaches Funny patriotism and how it is the most beautiful virtue in the world. He eventually becomes Funny's stepfather.
Captain Valentine has a large scar on his face, presumably from war. He has short dark hair and a stubble. He is seen in a dark uniform.
It can be inferred that like Funny, Captain Valentine is also patriotic, as he considers patriotism to be the most beautiful virtue in the world. He is friends with Funny's biological father, and is proud to have been, for he appreciates his devotion for his family. He seems to have some charismatic qualities, as he is a captain of the army's cavalry.
He became a captain of the army's cavalry and befriended Funny's biological father at some point. Later while he was visiting his friend's grave after his friend died, he finds the handkerchief his friend held. He decides to visit his friend's wife and son.
He visits a 7-year-old Funny. Funny's mother introduces Valentine to Funny and tells him to respect Valentine and his superiority as a captain. Captain Valentine tells Funny the story of his biological father. Captain Valentine would reveal that he was a friend to Funny's father, and was proud to have been, and then teaches Funny about patriotism and how it is the most beautiful virtue in the world. Captain Valentine then gave Funny the handkerchief his father used to remind himself of his son, and is last seen embracing Funny's crying mother. Funny kept the handkerchief since then.
As the name suggests, Captain Valentine remarried later with Funny's mother, giving Funny the family name of Valentine.
During his struggle against Johnny Joestar and Tusk ACT4, Funny Valentine recalls Captain Valentine's visit and story. He pulls out the handkerchief he's kept since the visit, to remind himself of that time, and to boost his resolve in defeating Johnny.
- “'Patriotism' is the most beautiful 'virtue' in this world. Even animals risk their lives for the sake of their children, but risking one's life for pride in their country and thinking of it as an extension of protecting one's family is only a 'nobility of humanity'... a kind of heart completely different from a religious fanatic.”