- Younger brother of Gorô Naya.
- Died of complications from pneumonia in November 2014.
- He and German voice actor Eberhard Prüter voiced Squidward from 'SpongeBob SquarePants' and Ducky from 'NCIS' in their respective languages. Eerily, Prüter and Naya died within less than a month of each other.
- His hobby was reading.
- Voiced Ferman Flaxseed in the Japanese dub of 'Animaniacs'.
- Voiced the Zenigata-like Inspector Daizo in the Japanese dub of 'Teen Titans: Trouble in Tokyo'.
- Provided narration in the Japanese dub of the 'Samurai Jack' episode 'Jack and the Labyrinth'.
- He had something of a sibling rivalry with Goro Naya when he entered the voice acting world. At first Goro encouraged him, but then wondered if Rokuro shouldn't do it after all. Early in his career, Rokuro was compared frequently with Goro, but when Rokuro came into his own as an actor, he expressed gratitude to Goro for encouraging him to act.
- The oldest voice of Squidward Tentacles, he voiced the character until he was 81 years old.
- Provided audio commentary in the place of Milos Forman for the Japanese Blu-Ray of 'Amadeus' (1984).
- Died on what would have been his brother Gorô's 85th birthday.
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