Delusional Thomas has been played on NTS shows including Mountain System Research w/ Michael Washington, with Bill first played on 26 October 2018.

Alter Ego Created by Mac Miller.

On November 1, 2013, Mac released a previous unannounced mixtape named Delusional Thomas, introducing the new character. The mixtape was produced by Mac under his production alias Larry Fisherman and features him rapping in a distorted pitched up voice.

He explained the voice choice saying, "to me it was a character and I wanted to give his whole own complete, like, everything. There was part of me that wanted to do my own voice, but I just wanted it to be its own complete character. And I feel like that evil voice inside your head is always kind of in that pitch."