Toby Fox

Toby "Radiation" Fox (born October 11th, 1991), also known as FwugRadiation, is a music composer and game developer. He developed the critically acclaimed RPG Undertale and produced its soundtrack in 2015. His avatar is the Annoying Dog.

Undertale
Along with being the main developer and composer of the game, Fox is credited with the conception of the following characters;
 * Froggit
 * Whimsun
 * Moldsmal
 * Loox
 * Vegetoid (with Temmie)
 * Migosp
 * Napstablook
 * Papyrus (with Temmie, special inspiration by JN Wiedle)
 * Sans (special inspiration by JN Wiedle)
 * Gyftrot (possibly)
 * Doggo
 * Dogamy and Dogaressa (possibly)
 * Greater Dog (with Temmie)
 * Undyne (design only)
 * Alphys (design)
 * Moldbygg
 * Mad Dummy
 * Shyren
 * Mettaton (special inspiration by Bob Sparker, Sarah, and JN Wiedle)
 * Tsunderplane
 * Pyrope
 * Royal Guards
 * Final Froggit
 * Whimsalot
 * Astigmatism
 * Madjick
 * Knight Knight
 * Asgore
 * Toriel

History
Fox originally started out as a forum member at the EarthBound fansite, Starmen.Net, under the alias "Radiation" where he managed the website's PK Hack forum up until 2011. He first entered the public eye with his infamous "EarthBound Halloween Hack", also known as "Press the B Button, Stupid!", which was a submission for Starmen.Net's 2008 Halloween Funfest.

Fox also produced music for the webcomic Homestuck, after which he would go on to create Undertale which was partially developed in Andrew Hussie's basement.