In an interview held at the Anime Expo, when answering what inspired him to become a voice actor, Okamoto mentioned that he has always been a big fan of Slam Dunk and thought the character Rukawa was really cool, so he wanted to be like him.

!, Katsuki Bakugo in My Hero Academia, Rin Okumura in Blue Exorcist, Ghiaccio in JoJo's Bizarre Adventure, Karma Akabane in Assassination Classroom, Isaac "Zack" Foster in Angels of Death, Yoichi Saotome in Seraph of the End, Louis Napoleon in Captain Tsubasa, Khun Aguero Agnes in Tower of God, Genya Shinazugawa in Demon Slayer: Kimetsu no Yaiba, Ryo Kurokiba in Food Wars: Shokugeki no Soma, Garfiel Tinsel in Re:Zero − Starting Life in Another World, Bete Loga in Is It Wrong to Try to Pick Up Girls in a Dungeon?, Liebe in Black Clover, and Obi in Snow White with the Red Hair.

Okamoto established and transferred to a new voice talent agency Raccoon Dog on April 1, 2022, following the closure of Pro-Fit on March 31.

[6] Okamoto has voiced many roles, including his involvement in character CDs and insert songs (soundtracks) for the anime.

[3] On March 21, 2020, Okamoto revealed that he is married to Asuka Ōgame after Shūkan Bunshun reported allegations of him having an extramarital affair.