helo, i'm sorry if this has been asked before [and if my 'facts' are a little off] but i was just thinking about the phrase 'fallen down'. in monster history book 6 i think it says that monsters who get too old are referred to as 'fallen down' before they turn to dust. 'fallen down' plays when toriel saves frisk from flowey so maybe when frisk fell into the underworld he was so hurt he died. i know the whole 'they're all dead' thing is a massive cliche but i just thought it was interesting
(undertale spoilers)
While the landing must have been uncomfortable, even with the golden flowers cushioning Frisk’s fall, it’s fairly unlikely that they’ve met their end there. Although "fallen down" is indeed a loaded term among monsters, it carries a very different meaning in regards to the humans.
Toriel and several other characters throughout the game make passing remarks about Frisk’s (and Chara’s) fall. Unlike when referring to monsters, there’s never any quotation marks to suggest an alternate meaning:
TORIEL:I pass through here every day to see if anyone has fallen down.You are the first human to come here in a long time.
TORIEL:Hee hee hee, I had a feeling.When a human falls down here, strangely…I often feel like I already know them.
TORIEL:Every human that falls down here meets the same fate.I have seen it again and again.
ASRIEL:It sounds like it came from over here…Oh! You’ve fallen down, haven’t you…Are you okay?
ASTIGMATISM (MONSTER TALE):The king decided it was time to end our suffering.Every human who falls down here must die.With enough souls, we can shatter the barrier forever.
ASGORE:Young one, when I look at you…I’m reminded of the human that fell here long ago…
Most of these lines suggest that humans (and by extension Frisk) have merely fallen down the hole in Mt. Ebott, without the additional meaning it carries for monsterkind. Considering how Frisk also proceeds to both act on their own and display a personality along the journey, and the lack of canon evidence, it’s very unlikely that Frisk died.