Venturi Leroy commands the space battleship Tiramisu as its captain, enforcing discipline and authority with a strict, stern leadership style. He holds the rank of colonel within the military hierarchy. Physically, he stands 1.78 meters tall, weighs 60 kilograms, and possesses light grey hair and grey eyes. His nationality is French, his blood type is A, and his birthday is November 20.

Despite his rigid command demeanor, Venturi Leroy possesses a profound soft spot for his daughter, Ligier Leroy. This indulgence resulted in her spoiled upbringing and the development of a somewhat selfish streak. Ligier treats the ship's pilot, Subaru Ichinose, in a manner akin to a younger brother. Venturi Leroy is occasionally depicted using a cane, wearing a hat, and sporting a beard and mustache. He participates in crew morale-boosting sessions.