the world of Undertale

Du, Frisk, warst ein Kind im Dorf. Du hattest vom Berg Ebott gehört. Du wolltest die Legende testen, dass man in einer anderen Welt landet, wenn man den Berg besteigt und in ein Loch fällt. Also bestiegst du den Berg. Eigentlich wolltest du nicht so springen. Du machtest einen Schritt, rutschtest aber aus und fielst in das Loch. Du schriest laut auf und stürztest hinunter, aber es war nichts Schlimmes. Du landetest auf gelben Blumen und hattest überlebt. Farben fielen auf die gelben Blumen. Es war dunkel ringsum, und du sahst nur einen Gang vor dir. Du standest auf. Was wirst du jetzt tun?

You were a child, Frisk. You heard about Mount Abbott and this legend. You went to this mountain and fell, but you landed on yellow flowers where the flower was falling. You only saw a corridor ahead and you stood up.

Toriel is the monster you saw first in the dungeon. She was very kind to you and taught you some tricks, but then you have to fight her.
Asgore is the king of the dungeon who can't find the last soul to escape with the other monsters to the human world.
Sans is a skeleton, a joker, serious about business and his brother "Papyrus" he was wearing a blue jacket and black sneakers you saw him after Toriel
Papyrus is Sans's brother, also a skeleton. He was wearing red shorts, black sneakers, and a blue coat (sorry, I don't remember how to put it on correctly).
He loves spaghetti and wants to join the royal guard.
Undyne - a fish/sprat, one of the royal guards wants to kill you and get your soul, she was wearing armor, but without armor, she was wearing a black T-shirt and sneakers
Alphys is a dinosaur-like creature who is a scientist in the dungeon and developed her own robot, Metaton. She is sweet and doesn't try to cause you trouble or battles.
Asriel is the son of Asgore and Toriel who is in the dungeon. He is kind to everyone and to you, he was wearing clothes and sneakers similar to Frisk's.