First of all, he doesn’t get more depressed as time goes on. His behavior changes only marginally as runs go, and mostly in response to Frisks’ expressions. He’d grow less happy as resets become more common, in that case. And he doesn’t. His mental state remains the same on the tenth run as it was on the first run.
Hm. I’d agree he’s in a better position to make sense of his feelings, since he understands time travel. The thing is, people usually write Sans as if he has some strong connection between the timelines and ability to make sense of it, well and beyond other monsters. I’d argue that he doesn’t even know MORE than any other monster, that Undyne is probably the monster that remembers the most. Make the most sense of the impressions he has? Sure. But ‘memory’ is a strong word for the things that monsters have after resets or LOADs, especially considering how many people consider Sans to have near-total recall.
And anyway, is he that depressed? Like I get that people like to give Sans a lot of existential angst and that’s a fine headcanon, fine but the closest we get to seeing him ever really looking and sounding tortured is, uh, either after everyone he knows and loves is dead or when we’re in LOST SOUL mode, and he seems to be talking about a completely unrelated event.
Anon, you realize that depression doesn’t necessarily need to be triggered by a severe event to *be* severe itself, right? Sometimes it just starts as a screwy chemical imbalance in the brain, that on a good day makes it hard to give shits, and on a bad day makes every downward turn in life twenty times more demoralizing than it’d otherwise be.
I’m just saying, Sans can be depressed without it all being related to timeline angst. He doesn’t show existential despair over the existence of resets outside of NM (where, everyone is dead, at the hands of an unstoppable entity – a really fucking bad enough situation to deal with without having a case of the badbrains on top!), and, like saveloadreset says, whatever he’s talking about in the Lost Soul fight seems likely to be more related to the workshop, Gaster, etc, than to anything Frisk’s done.
THIS THIS THIS THIS
honestly just really like undertale 