As a voice actor, some of his most notable roles are Vash the Stampede in Trigun, Ichigo Kurosaki in Bleach, Yu Narukami and Tohru Adachi in Persona 4, Nero in Devil May Cry, and Lelouch Vi Britannia in Code Geass.

[9] He and Narvy also starred in the film Wicked Game, also known as Extreme Heist, which was directed by Sakamoto and features several other Power Rangers alumni.

In 2023, Bosch reprised the role of Adam Park in a 30th-anniversary special, Mighty Morphin Power Rangers: Once & Always, which was released on Netflix in April of that year.

[13] Bosch made his voice acting debut as Shōtarō Kaneda in the cult classic anime film Akira.

Also in 2001,[citation needed] Bosch was also cast as the lead role of Ichigo Kurosaki in the hit shonen anime Bleach.

Johnny voiced Yun Arikawa in the 2021 Netflix kaiju anime series, Godzilla Singular Point.

In 2011, he voiced Yang in Super Street Fighter IV Arcade Edition, the protagonist Yu Narukami as well as the antagonist Tohru Adachi in the Persona 4 games and its anime adaptation.

[14] On July 4, 2017, he voiced Broccoli Punch in Cartoon Network's Mighty Magiswords, recording with fellow Power Rangers actor Paul Schrier.

[15] He reprised his role as Broccoli Punch, as well as playing the Giant Monster and Whiney, in the second season two-part episode "The Incredible Tiny Warriors".

"[4] His musical inspirations include The Beatles, Foo Fighters, Nirvana, Oasis, Led Zeppelin and also movie soundtracks.

Bosch described the album as "something you could just listen to and could move you to feel something" and that "the titles were a reflection of the emotions we felt as we wrote the songs".