Goat Dad

"Human I promise you... For as long as you remain here... My wife and I will take care of you as best we can. We can sit in the living room, telling stories, eating butterscotch pie... We could be like... Like a family...""

- Asgore talks to Frisk after the battle on the neutral route.

Goat Dad is the family ship between Asgore Dreemurr and Frisk from the Undertale fandom.

Backstory
Asgore is the king of monsters in the Underground. He was peaceful until his children came to the surface and the humans killed them and after that he made a law that every human who fell into the underground must die. He wanted to collect seven souls so that with their help he could open the barrier that holds the monsters under Mount Ebott. For a long time, monsters have been collecting the souls of children who fell here. All of them are kept in special flasks in Asgore's castle, and their corpses are in coffins in the basement.

Frisk is a person whose past is unknown, just like their gender. All this is determined by the player, since Frisk is created for free interpretation.

Neutral Route
Throughout their journey into the underground, they hear monsters mention Asgore as a danger to him and as the reason why they collect souls. Toriel tried to stop Frisk from leaving the Ruins, because Asgore could kill them, but by showing determination, the child showed that they could move on and take care of themselves. Frisk also finds the belongings of fallen children who were presumably killed by Asgore.

Frisk learns the king's backstory when he is in the New House. The monsters tell them about this as he passes on. And finally, they meet in person in his garden while Asgore is watering the flowers. The big goat is clearly confused by this meeting, he understands that he has no other choice but to kill the child, although he is sad about this fact. Asgore tells Frisk to think of it like going to the dentist. They have a fight, during which the king destroys the mercy button. After this, the player has the choice to kill Asgore or not, if the choice is mercy, then Asgore will offer Frisk to become a family together and leave the past behind. However, regardless of the choice, the king was killed by Flowey and he begins a battle with the child, who can also kill or spare him and then leaves the underground.

True Pacifist Route
Asgore fights with Frisk, but they are saved by Toriel, after which the other characters from the main cast ask to stop the fight and they all get together. Everything would be fine if Flowey had not captured human souls and the souls of all monsters in order to take the form of Asriel and fight Frisk, who during this frees the souls of his friends, including Asgore. After this, Asriel apologizes to Frisk and asks them to take care of mom and dad before leaving.

Frisk wakes up and sees their friends standing near them and worrying, thinking they have fallen unconscious. The Child may have several dialogues with Asgore, who apologizes for trying to kill them. After everything, the monsters and Frisk escape from the Underground, finally gaining freedom.

Genocide Route
Undyne, before her death at the hands of Frisk, warns them that Alphys is calling Asgore and telling him to absorb six human souls to stop them. For some reason, this does not happen and the king does not recognize the child as a human and asks them to drink a cup of tea with him and calm down, but Frisk kills him without hesitation.

Moments

 * It is Asgore's voice that Frisk hears when they dies. Asgore says that the protagonist should not give up and he needs to be decisive.

Fanon
People interpret their relationship in fanon differently. In some fan works, we see how Frisk is trying to help Asgore get back together with Toriel, and also spends time in his court and they have a nice conversation about something. Also, there are works in which Frisk thinks that Asgore killed the rest of the fallen children, which makes their relationship a little more complicated.

In a fairly popular AU called Underswap, Asgore was Frisk's adoptive parent before they died.

Fandom

 * FAN FICTION