Memes in DONTFORGET

I was playing Undertale and this happened can someone explain who this character is?

T H E H A R L O W S

I've heard Harlow can make dark fountains...

YORE TAKING TOO LONG

this is gotta be my favorite part of the prophecy

guys i MIGHT be dead

Round 2

Nothing unoridnary is transpiring as of late, so here.
A much older footage.