Yamadera Kouichi roles (drama)
Kouichi has done the following roles in audio drama.
| Aa Megami-sama Tokuten Ou [CD] | Troubador |
| Bouken Radio Movie [CD] | Enjouji Tatsuma |
| Combination [CD] | Hashiba Shigemitsu |
| Fam & Ihrlie [CD] | Migel |
| Izumi Gensenki -Meidouhen- [CD] | Kisaragi Shirou |
| Outo Ayakashi Kitan [CD] | Fujiwara Masayuki |
| Photon [CD] | Papachariino |
| Sokkou Seitokai [CD] | Ohtani Kouichi |
