Immediately, Frisk starts scrambling up the stone. It seems sheer from the edge above, but they've been running around stealthily for quite some time now. They know the tricks that even the players wouldn't ever have a chance to figure out.

"You know!" they exclaim when they pop over the wall. And then they stop and stare, because...look at this. Another human character--that isn't Chara. An unusually strong rush of shyness overtakes them, just for a second, and their voice goes back to its usual level of quiet.

"I'm...I'm the main character, here, sort of. Undyne's the monsters' hero, though, 'cause they don't know what a main character is."