Toby Fox has been played on NTS in shows including samb_rules, featured first on 9 June 2016. Songs played include Weird Birds, Dummy! and Good Night.

Toby Fox is an American developer and composer behind the 2015 hit indie video game Undertale.

In 2018, Toby Fox released Chapter 1 of his game Deltarune, following suit and composing the soundtrack on his own. Chapter 2 followed in 2021, Chapters 3 and 4 in 2025, and Chapter 5 slated for release in 2026, each accompanied by his music with minor contributions from other artists. In 2020, Fox contributed to the OMORI soundtrack.

Additionally, under the alias Radiation, Fox composed music for the webcomic Homestuck. He has also contributed a small handful of pieces to notable Nintendo titles, including Super Smash Bros. Ultimate, Pokémon Sword and Shield, and Pokémon Scarlet and Violet.

Fox is secretive and does not typically do interviews. He has chronic wrist and hand pain that regularly disables him from programming and composing. In September 2020, Fox cited a flare-up of this pain as a factor in the delayed development of Deltarune's second chapter.