Board Thread:General Discussion/@comment-26006155-20200107155350/@comment-26006155-20200123042125

Sans was once the hero. He knows what it's like, being able to save and load. He had to, in order to test Frisk to see if he remembered how to do the same thing.

Just because Frisk has more conviction that Sans, and more Determination, doesn't mean that Sans has never had the most determination.

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I didn't think Undyne could remember things from previous runs.. but maybe I'm wrong: https://undertale.fandom.com/wiki/Undyne

 The Protagonist Edit
Undyne initially despises the protagonist and believes that they would be more useful dead than alive.[20] If the protagonist spares her and offers her water in Hotland, she begrudgingly befriends them if they have earned no EXP. Though Papyrus tricks Undyne into befriending the protagonist, she genuinely cares about them at the end of their date.

If the protagonist earned no EXP and befriended Undyne in a previous route, she remembers them as a friend but brushes off the feeling before her battle.[21] -
 * ↑ "The whole time I was chasing after you... I felt something... Strange. The echoes of something warm, something... Something like 'I miss being friends with you.'" - Undyne

So... Undyne has a deja vu shadow of a memory of being friends with Frisk, if we befriended her in a previous run?

That's new. I never knew that before.

So... perhaps Determination does play a role in remembering things between runs?