Here are my takes of ETO as crossovers:

DDLC!Sans as the replacement of Killer.

Aoharu!Sans and Hoshino as the replacement of Hard-Mode. (I'm too lazy to draw her now tbh.)

AND!Sans as the replacement of KAB.

TSBP!Sans as the replacement of Dust.

Backroom!Sans as the Replacement of Last Breath.

Punished!Sans and Elma as the replacement of TITR/Conceptualized Neutral Run.

Who!Sans as the replacement of Horror.

Smile!Sans as the replacement of Insanity.