You. Or the human. are named Oliver. You fall down into the underground because of your parents are nothing like parents should be. When you fall down you meet a ghost . Or the first human to fall in the underground. Cristel. You travel through the pastifice route till you find out you can reset and do other routes. So after that you reset to do Genocide. The characters you meet one the way are : Flowey the flower, Toriel the old goat mother, Papyrus the human/skeleton hybride, Shadow the monster/human hybride and caring wife/friend, H chara a loving mother and wife of Shadow also princess of the underground, Judgement a hyper the hyper son of Shadow and H chara, Chara The ghost human scientist brother of Papyrus and Shadow, Frisk the human ghost scientist also brother of Papyrus and Shadow, Undyn Captine of the royal gaurd/Angry fish woman, Alphys scientist/Anime loving lizard, Mettaton husben of papyrus and the only enternaner, Grillby the bartender and the husben of Chara, Asriel the prince of the underground and husben of Frisk, Midnight princess of the underground daughter of frisk and asriel, Flame son of mettaton and papyrus, Lily daughter of chara and grillby, Asgore king of the underground, muffet the spider baker, -And many more-
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