Toshio has done the following roles in audio drama.

Aoki Densetsu Shoot! Densetsu tanjou he no joshou [?]	?
Cutie Tenshi (Angel) Chougouka Yume no Saiten [CD]	Manmaru
Cyberbots [CD]	Dr Shutain
D-Xhird [CD]	Saotome
Ganbaru Sentai Mare Ranger [niconico]	?
Kishin Heidan Rei [CD]	?
Metal Gear Solid [CD]	Sergeant Allen Iishiba
Ring (CD Book) [CD]	Asakawa Tooru
Sei Elza Crusaders [CT]	?
Sotsugyou Vacation [CD]	ghost