Asgore is a Boss Monster with broad shoulders, a golden blond mane and beard, and two large curved horns. He wears a suit of armor, a purple cape with golden pauldrons, and a crown on top of his head; he also sports a bulky stature. The weapon he uses in battle is a long, red trident adorned with a flower.
Asgore is a kind monster that enjoys gardening, Golden Flower Tea, and Toriel's Butterscotch Pie. Like his son, he speaks in southern slang (most notably "howdy" and "golly"). Before his battle, he offers the protagonist many opportunities to explore the Underground and is reluctant to fight them at all; he even suggests that Toriel, the protagonist and himself live as a family if the protagonist spares him.
Monsters in the Underground look to Asgore for hope, and his plan to collect seven human SOULs is one of the few things that keep them going. However, Asgore does not want to kill anybody and feels so guilty that he offers the protagonist his SOUL to "leave this cursed place." Though he is miserable because he has killed humans, he feels that it is his duty to his people to battle the protagonist.
Asgore lives in the past and wants nothing more than to see his wife and child again, even though they have been gone for a long time. He reiterates the same phrase in his journal every day, perhaps in denial that life has changed since Asriel's demise.
Monsters also note that he is bad at naming places and names locations, the names being quite literal (such as naming the monster's first home in the Underground "Home", and naming their new home "New Home"), and Gerson suggests this may be because Asgore is not the most intellectual monster, with the smarter member of the royal family as well as the one which was actually running the city being Toriel.