Hiyama has appeared in several popular Japanese magazines in which he has done photo shoots, interviews, news reports, etc. Some such magazines he's been featured in includes AnimeV, Animedia, Seiyuu Grand Prix, Virtual Idol and Animage.
As of early October 2007 according to Anime News Network, Hiyama is one of the most prolific male seiyuu in the industry with a total of 155 roles and is tied with Ikue Ohtani.
Hiyama's favorite food is ramen.
Hiyama made an appearance at many special events including the "Seiyuu Grand Prix Commemoration Event" on December 11, 1994; the "Seiyuu Collection" on May 11, 1997; the "'fasti & Luster' album live" on October 26, 2003; the "Comic Market 66 Onsen booth" on August 15, 2004 and the "Twinkle Date Ii Ase Kakouze Natsu!" on August 6, 2006.
Shin in Cowboy Bebop (eps 25 & 26)
Koujiro Hyuga in Captain Tsubasa J
Black WarGreymon in Digimon Adventure 02
Yushiro Gowa in Gasaraki
Tetsuya Kouji in Godannar
Ers Blue in Infinite Ryvius
Pedro in Jungle no Ouja Taa-chan
Kojuurou in Kimi ga Aruji de Shitsuji ga Ore de
Masanosuke Date in Lime-iro Senkitan
Suguru Kashiwagi in Maria-sama ga Miteru ~Haru~
Chenshin Kao in Planetes
Kankuro Nishiyama in Ramen Fighter Miki
Giovanni in Romeo no Aoi Sora
Hirohiko yokomi in Tetsuko no Tabi
Yoshimune in Yoshimune
Maito Senpuhji in Yuusha Tokkyuu Might Gaine
Hiyama made a guest appearance on the radio show, "Tokyo Boogie Night" on March 15, 1997. He made three more appearances on this show on November 23, 1997, May 30, 1999, and April 6, 2003.
On June 1 1996, Hiyama released his first solo single, "Glass no Summer Days"
On June 1, 1995, Hiyama released his first solo album, Prototype. This CD contains 10 tracks, and contains backup vocals from Yuri Shiratori.
Hiyama has voiced characters in numerous CD dramas including Junji Midorikawa in Wedding Dress ni Akai Bara, Torikawa Takaaki in Okane ga nai, Reiji Sagimiya in Ai Death Gun, Kiwamu Kimishima in Super Stylish Doctors Story and Otomiya Yuuichi in Ecstacy wa Eien ni.
On the OAV, Brave King GaoGaiGar Final, Hiyama, along with the rest of the cast, performed the second ending theme "Itsuka Hoshi no Umi de".
Some of Hiyama's hobbies includes doing historical research, and driving.
Hiyama is employed under the talent agency, Arts Vision.
Hiyama stands in at 166 cm (5 feet, 3 inches) tall, weighs approximately 60 kg (132 lbs) and has blood type A.
Hiyama's shoe size is 25 centimeters (size 7 in mens).
Among his roles, Hiyama is better known for playing the hero, Link, in The Legend of Zelda series, and Joe Higashi in the Fatal Fury/King of Fighters games. He's also known for playing Demitri Maximoff in the Darkstalkers games.