His notable works include Anthony Brown in Candy Candy, Joe Shimamura in the 1979 iteration of Cyborg 009, Jerid Messa in Mobile Suit Zeta Gundam, Kakashi Hatake in Naruto, Kars in JoJo's Bizarre Adventure, Toichirou Suzuki in Mob Psycho 100, Gildarts Clive in Fairy Tail, Yoriichi Tsugikuni in Demon Slayer, and Neuras in Metaphor: ReFantazio.
More recently, he is known internationally for roles such as Kars in JoJo's Bizarre Adventure, Kakashi Hatake in Naruto, Eiri Yuki in Gravitation, Aion in Chrono Crusade, Hatori Sohma in Fruits Basket, and Nyanko-sensei/Madara in Natsume Yūjin Chō.
This wide and versatile vocal range allows Inoue to voice roles of varying personality types: hot-blooded, righteous main characters such as Joe in Cyborg 009 and Akira Kogane in Golion; coolly arrogant bishōnen typified by Eiri Yuki; the amusingly fussy yet powerful mazoku (demon), Guenter in Kyo Kara Maoh!
Inoue is also well known for more unusual roles such as the crossdresser Nagisa Sawa in Haru wo Daiteita, and Shiron the Windragon in Legendz, who spends half his time as a screeching hamster.
His most well-known songs are the ones related to the Harukanaru Toki no Naka de Hachiyō Shō series, which he performs live on stage at the annual NeoRomance voice acting events in Japan.