He wears a standard Marine outfit and has blond hair, while his facial looks seems kind of similar to that of an old man. When he was a kid, he wore a blue sleevless shirt with a smiley face on it, and under it he wore a white T-shirt.
Not much is known about his personality.
As a kid, he seemed to be somewhat energetic.
He, along with Rapanui Pasqua, Isoka, Pukau and Akibi, managed to stop Wetton from pillaging Ruluka fifty years ago, and ends up in Ape's Concert through the Rainbow Mist along with Ian. He released Ian, who was prisoner of the Pumpkin Pirates since their arrival, when Ian made him believe he will behave nicely.
After that, he and friends met the Straw Hat Pirates and an aged Henzo and with their help, they managed to stop Wetton from taking over Ape's Concert. Rongo manged to return home along with his friends. Years later, he and his friends became members of the Marines.
- His name is similar to the Rongorongo, a system of glyphs discovered in the 19th century.