- After graduating from high school, Ishii went to the Tokyo Announcement Academy where he studied to become a voice actor.
- During his junior high school days he played a game called .hack//G.U. and became a fan of Takahiro Sakurai who inspired him to become a voice actor.
- He won the 13th Seiyuu Awards for Best Rookie Actor.
- He was married to Atsuko Enomoto on 2016 and announced their divorce on August 9, 2018.
- He is the son of Japanese father and Filipino mother, and lived in Philippines for 4 years as a child and returned to Japan for his school education.
- He has been diagnosed with a maladjustment, causing him to take a hiatus from voice acting.
- He was also a member of his junior high school tennis club.
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