You were a human, living on the surface, you didn't like your life, and decided to get away from it for a bit, and went camping near Mt. Ebott, it seemed relaxing...
Once you arrived, you got everything set up, and relaxed for a bit, but overall, you were deadset on one thing, climb the Mountain.
After about an hour of trekking up, you reached a cave in the mountain, a large pit, seemingly going miles down, was right in the center, it managed to catch your interest.
You stepped closer, carefully avoiding falling in, staring down, a faint blob of Yellow was at the bottom you wondered what it was..
While looking down, you heard what sounded like faint communication, you wondered even more, but as you leaned closer, a rock chipped off under your foot, and you fell into the Mountain...
Hundreds of feet, you feel, slowly losing consciousness as you panicked and tried to stay awake, your vision slowly fading as the the yellow blob grew closer..
You slowly woke up, feeling strange, smaller, more petite, like a small child, you were laying in a golden flower bed, unsure if you were alive or not...
Looking down.. you saw a striped shirt... And was completely different! You were a small child, though you couldn't directly determine your age, with a long-sleeve neon green sweater with a single horizontal cream stripe on, and brown pants and shoes. You had cream skin, brown medium-length hair with side-swept bangs, and rosy cheeks. You also have brown eyes.
You sat up, as a paw was out in front of you, looking up, you saw... A goat.. monster? He was like you, matching your now young age and wearing the same clothes as you, just without shoes. He looked down at you with a sweet smile, before speaking.
Asriel: "Come on Chara! We should keep playing!"