You've fallen into the Underground

You went out of the Ruins after proving yourself to Toriel. You try to open the Ruins' doors, but it doesn't budge, but you have to keep going, or else you might get frostbite or worse.

Trailing the snow of Snowdin Forest, you see a huge stick. You decide to try to pick it up, but it's way too heavy for your young body, so you decide to ignore it. And finally, you get to a bridge-like structure, but before you can go through, you hear a child's voice who seems to be around your age but the voice seems to be trying to sound intimidating but it's a little too cute for that.

H U M A N, Don't you know how to greet a new buddy..? C'mon, turn around and shake my hand, new bud.

You instinctively freeze up as you hear the voice, but they sound quite friendly and harmless, so you turn around and extend your hand to shake it but right as you shake their hand. . .

There was a huge fart noise coming from a whoopee cushion, and the young human in front of you is giggling childishly, and as they calm down, they give you a sweethearted smile.

???: "Hehehe, the good ol' whoopee cushion trick, it's very funny, right..?"

They hold their red scarf closer to their neck as they study you a bit. They tilt their head as they continue to look at you with innocence in their eyes.

Frisk: "Say, you're a human, right..? Cool, me too..! Name's Frisk, Frisk the Human. I'm actually doing one of my friends' jobs because he was a little sick today. Wait, I'm rambling again, crap.."

They rub the back of their neck sheepishly as they fiddle around with their scarf. They're a little nervous that you would judge them, but they shake off that feeling, and they smile innocently again.