- He is skilled at playing shogi, having the Shogi Certification in 3rd Class. He appeared in several Shogi events on Niconico and appeared in a Pokémon game event on Niconico as well.
- In the third Seiyu Awards held on March 7, 2009, he won the award for best rookie actor for his portrayals of Accelerator in A Certain Magical Index, Shin Kanzato in Persona: Trinity Soul and Ryuji Kuhoin in Kure-nai, when he graduated from university.
- He's the host of a radio program about gaming called RADIO 4Gamer from 2010 to 2015 then the program changed its name to RADIO 4Gamer Tap and continue on with Okamoto being a host.
- In the fifth Seiyu Awards held on March 5, 2011, he won the award for best actor in a supporting role for his portrayals of Takumi Usui in Maid Sama!, Eiji Niizuma in Bakuman, and Accelerator in A Certain Magical Index.
- In an interview held at the Anime Expo, when answering what inspired him to become a voice actor, Nobuhiko 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.
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