Asgore Dreemurr is the ruler of the Underground and its denizens, monsters. He is the ex-husband of Toriel, father of Asriel Dreemurr, adoptive father of the first himan, and the penultimate boss of the Neutral Route. While not evil or malicious, he serves as one of the main antagonists, planning to kill seven humans and use their SOULs to break the barrier which traps the monsters in the Underground.

Asgore often speaks lightly in the game, yet maintains a deep voice of authority. He is the king of this land, so he must show it, even if he is one of the kindest monsters there.