None of the Ralsei memes seem to be canon...

RF!Underfell Sans

I told Ralsei he was a girl so much, I killed him.

New flowey faces (for jumpscares and the like)

!!!!!!!!!!!!!!

In case you're wondering what Herzenskummer (Toriel's theme) means, here it is.

SUSIE HAS A CRUSH ON ME!!!!!!

This doesn't seem that Noelle-like

Aclonica the Skeleton. Yes... I do know he looks exactly like purple Sans, he wears a purple replica of his grandfather's clothes.

Arial overworld sprite