- Older brother of Rokurô Naya.
- Voiced Sam the Eagle in the Japanese dub of 'The Muppet Show', alongside Yasuo Yamada as Kermit the Frog.
- Like Yasuo Yamada, he was angry at being replaced for 'Lupin III: The Fuma Conspiracy'.
- He was a fan of the Hanshin Tigers.
- His hobbies were sake and baseball.
- Was best known as the voice of Inspector Koichi Zenigata in the Lupin III anime franchise which he has done for 41 years until he retired from the role.
- He attended Yasuo Yamada's funeral. When he saw Yamada's picture, Naya tearfully said in his Zenigata voice, "Hey, Lupin, who should I chase from now on? Who should I chase if you die?".
- He despised the term "voice actor", as he felt that voice acting was just as worthy as acting on stage or screen.
- He was a supporter of the Japanese Communist Party.
- He was hospitalized for a gastric ulcer in March 1985 during the broadcast of "Lupin III: Part III" and underwent surgery to remove half of the gastrointestinal tract.
- Voiced the Chairman Mouse in both the 1981 and the 2000 dubs of 'The Rescuers'. He also reprised his role for the dub of 'The Rescuers Down Under'.
- Provided audio commentary in the place of Peter Shaffer for the Japanese Blu-Ray of 'Amadeus' (1984).
- Voiced the King in the Japanese dub of 'The King and the Mockingbird'.
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