the world is a game.
no, really. frisk knew this from the moment their player’s copy of Undertale was downloaded.
…and they were the one character who knew this, as it turned out. not even “chara” knew; they only learned the truth of the world through narrating the playthroughs and influenced by the final murder run.
everyone gets bored, eventually. the player certainly did, after pouring months of effort discovering every secret possible. the game ended with the world being destroyed, and it was never picked up again.
frisk got bored. “chara” got bored. they picked through the code, learning all they could, but even that wasn’t enough to keep their interest.
and so the two that were left chose to travel.
dusty, empty, unbooted undertale was left behind.
2018-07-09
frisk and “chara” share an overworld sprite body at all times. frisk is the one most often visible, though “chara” can overwrite frisk with themselves if deemed necessary–changing their entire appearance, down to their sweater and skin. this will almost never happen; if they manage to be coaxed out, they’ll merely start speaking through frisk’s mouth and moving their limbs.
while armed with the locket and knife, their stats are maxed out. exactly how much that matters depends on where they’re visiting.
they break code. it’s in the username. while they can do this to destroy it, they more often break into it. this means they can code themselves into most games, and so won’t necessarily die forever if killed, even within a game that isn’t undertale. on the other hand, they’re not perfect at it; there’s definitely a change for a glitch or two in how they interact with their environment or others.