Doomguy's beloved pet rabbit. At the end of Doom (1993) it is revealed that Daisy was a casualty in Hell's invasion of Earth, having her decapitated head on a pike. In Doom Eternal, Doomguy frequently hallucinates Daisy throughout the game.

In furry artwork, Daisy often takes the role of an anthrofied form of Doomguy, often brandishing his weapons and armor.