Toshihiko has done the following roles in audio drama.

Aozora Shoujotai [CD]	Hiyama Sanshirou
Bastard [CD]	Kallsu
Bouken Radio Movie [CD] {1}	Nabucom
Cobalt Tokimeki Drama CD Remix [CD]	?
Crescent Noise [CD]	Tarushushu
D.N.Angel Wink [CD]	?
DN Angel [CD]	Niwa Kosuke
Dragon Quest Retsuden -Roto no Monshou [CD] {Volume 1}	Kadaru
Ehon Ohanashi Concert Ongakushuu [CD]	?
Emerald Dragon [CD]	Atorshan
Garzey no Tsubasa [CD]	narration
Gekkou no Pierce [CD]	?
Gin no Messiah [CD]	?
Gundam Wing [radio]	Duo Maxwell
Haoutaikei Ryuu Knight [CD]	Hittel
Harukaze Sentai V Force [CD]	?
Koko wa Green Wood [CD]	Tezuka Shinobu
Queens Road -Gaiden- Orashion ha moeteiru ka! [CD]	?
Saiyuuki [CD]	Genjo Sanzo
Samurai Spirits [CD]	?
Shounen Onmyouji: Kazane hen [CD]	?
Street Fighter II [CD] {Gaiden, Cammy Tatakai no Jokyoku}	Major Worlen
Tatoeba konna love song [CD]	Takase Ryuusuke
Ten ha Akai Kawa no Hotori [CD]	Ramses
Trigun -The Second Donut Happy Pack- [CD]	Legato Bluesummers
Unjou Roukaku Kidan [CD]	Kasai