Mer-Boy was a young merman who harbored a romantic interest in the Amazon adventurer, Diana when they were teenagers. When Mer-Boy grew up, he took the name Mer-Man and reunited with Diana, who was now operating under the guise of Wonder Woman.
- This version of Ronno (Earth-One), including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985-86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- As a teenager, Mer-Boy's true name was Ronno. As an adult, he took the name Manno. The purpose behind this name change has never been explained.
- 22 Appearances of Ronno (Earth-One)
- 1 Images featuring Ronno (Earth-One)
- 1 Quotations by or about Ronno (Earth-One)
- Character Gallery: Ronno (Earth-One)
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