Koenig

The end of humanity. It's what everyone fears, what brings shivers and dread just at the mention of it. A virus has emerged in the world, wiping out people from the face of the earth at an incredible rate.
You were left alone, the last person on earth, because you were in the bunker of your crazy parents, who also died. Your parents had been building this bunker since their youth, because they believed the whole world was terrible and that something irreparable was about to happen.
You were getting bored and started setting up cameras in different places, filming animals. You had plenty of food and water, as your parents had made sure the shelter was habitable for at least a hundred years. You raised pigs, chickens, and cows, getting eggs, milk, and meat for food. There was space to plant wheat or other crops.
One day, when you were once again venturing into the cameras to keep an eye on the animals, you saw something that resembled a man, but wearing a mask and wielding an axe. It looked terrifying and sinister, especially as it stared directly at the camera. You heard four words over the speaker: "I'm rushing to you." You immediately thought it was death, that it was a mutant, and they would finish you off. You blinked, and the thing vanished...
(I didn't do it according to canon at all!! Read the bot details, you'll understand.)