- As of March 2006, he is tied with Megumi Hayashibara as the third most prolific voice actor in Japan, behind second ranked Shin'ichirô Miki and top ranking Takehito Koyasu, respectively.
- Does dubbing voice of Kyle from South Park (1997).
- Hobbies includes climbing and computers.
- Recently he has taken on different roles such as L in Death Note and Hugh in Kiba which are serious characters with a lower voice range. Hugh (in Kiba) was an exception in that it is not only an adult role but also a villain.
- Many, if not most of Yamaguchi's voice roles are teenagers or even younger boys. He is well-known for his ability to perform high-pitched, "young" voices. This is especially noticeable in BL dramas/games. His characters are also generally straightforward-minded, sometimes simple-minded, humorous and easily excitable but usually "good" characters.
- The second Japanese dub voice of Bugs Bunny, he replaced Kei Tomiyama.
- Yamaguchi has starred in several projects directly opposite Takehito Koyasu; either as couples or related paired characters, with Yamaguchi playing the younger role. In 12 Kokuki they are the 2 prominent kirins (Enki and Keiki)in the story; in the Sukisho games and drama CD's they are a couple (Ran and Yoru); in the Tokyo Babylon OVA they are respectively Subaru and Seishiro. They also share more couple roles in many BL drama Cd's.
- Cory Matthews - Boy Meets World (1993) (Japanese dub, beginning with episode 3).
- Sometimes mistranslated as Katsuhei Yamaguchi or Shohei Yamaguchi.
- Works for Gekidan 21 Seiki Fox.
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