Board Thread:General Discussion/@comment-27907368-20160323193924/@comment-26887879-20160514000341

CoolDude1111 wrote: I have this: http://undertale.wikia.com/wiki/Thread:85678 and I think Frisk is a homeless child. It says on the Kickstarter that Frisk was seeking refuge from bad weather, assuming they don't have anywhere to go. Actually, that child was Chara, not Frisk. (The year mentioned was 201X and that's the year Chara fell)

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Sans knew when you'll show up after you escape Ruins, because of his research/keeping the track of anomaly. That's why he's able to mess with you as soon as you enter Snowdin Forest...