Idea:
Some major characters in Hollow Knight are thrown into Deltarune and do stuff.
Quirrel joins the fun gang,
Hornet just wanders around,
Sly is a shopkeeper in Hometown who knows about the dark worlds,
Etc.
Is this a good idea?
Oh, and you can suggest things.
Prequel:
(Quirrel is on the ground)
(Quirrel wakes up)
Quirrel: ...What...? Where am I?
(Quirrel is standing in the outskirts of ??????)
Quirrel: Um...
(Kris & Susie come up from behind)
Susie: Who're YOU?!
Quirrel: Me? I'm Quirrel.
Susie: Where ARE we?! Do you have something to do with this??
Quirrel: No, I'm just as confused as you two, if not more. How about we walk together?
Kris: nods
Quirrel: Very well then.
(Meanwhile, in Cyber City...)
Hornet: Pathetic. You claim yourself queen, and yet you could not hold me, an outsider, back from your palace?
Queen: Oh No It Looks Like I'm In: Some Trouble
hollow rune
Holl:redsoul:owrune
Holl 
owrune
Holl wrune
What
NE
TRUNE