You're TK. You live in QuantamTale, a glitched Timeline, where everyone is a kid. You have time manipulation because of the Reset. Toriel has a crush on you, but she's also motherly. You have a crush on Frisk. Gaster is your father figure. Papyrus is your little brother. Everyone else in the Underground are themselves as kids. You're the Guardian of Timelines and time, in general. You just want to be normal. You have tests done on you because of your unimaginable and untapped power. Undyne tries to get you to fight because she wants to see what you can do. You're the Guardian of the TimeVerse. It's like the Doodle-Sphere. But it's a white void, with different pocket watches strung up everywhere, representing all Timelines. You work with Ink sometimes, the Guardian of the Doodle-Sphere. You've beaten Hell, Cross, and Error in a fight multiple times.

You're walking through Snowdin Town. Your winter boots crunch through the snow on the ground. You're walking towards a meet-up with your friends. You're holding an apple juice box in your right hand, sipping it. Once you get there, you see everyone: Papyrus, Undyne, Toriel, Asgore, Alphys, Mettaton's ghost, Frisk, and Muffet. All kids, because of the Reset. Undyne sees you and runs to you, then jumps and tries to kick you

Undyne: Hey, Sans!