Idea: After frisk free the monsters from the underground Sans and Papyrus found a message from there father w.d gaster. They find out they have a sister who is papyrus twin is living on above ground all these years.
Fact: The war between monsters and humans happened a very long time ago. Monster age normal as kids but when hit adulthood they age very slowly. Sans and Papyrus mom was human she die from the war for having children with a monster. The war happened when sans was 3 years old that why he doesn't remember his sister and Papyrus was a baby then. Their sister was talking care of by a nice human family who was the friends with gaster and his wife.
Info: She lived a nomal life until she was told the truth about her real family. Gaster lift notes and letters for his child to understand not to go after them she will die if they do. She find out she will age slowly now and out live her adopted family. So she travel the world over the years trying to find a way to free the monsters. She didn't believe in killing and taking souls.
I'm can of shock this got alot of views but thank you!
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Undertale story ideas
FanfictionJust a ideal book for stories about Error or force god of destruction Error or just some ideas for undertale stories I like to write down ideas to help me out for stories I want to write later or if I'm having writers block. You can check it out if...