Terashima graduated from Tokyo Announce Gakuin, voice training school. He had initially belonged to Holypeak until December 2008, and then to Production Baobab up until September 2011 when he switched to Axlone, Toshiyuki Morikawa's own agency. He is married to voice actress Satomi Satō. On December 30, 2021, Terashima and Satō announced the birth of their first child.

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