Nishio began working as a voice actor under the name, Takumi Nishio (
|1993||Hana Yori Dango||Tsukasa Domyoji|
- He is married to Tomomi Nishimura, who portrayed Akira Mimasaka's mother in Hana Yori Dango Returns.
- Yoko Kamio met him and Takuya Kimura during the recording of the first drama CD. She told them, " you two fit the images [of my characters] perfectly." Kimura joked with Nishio that she meant he was "as dumb as Tsukasa".