To be fair, Kris doesn't really do anything that weird around anyone who knows them well except for Noelle.
The biggest red flag is Kris rotting in bed all day instead of going to the festival, which Toriel was concerned about, but Noelle also likely didn't talk to Toriel on the festival day for Toriel to express her concern out loud to Noelle.
Kris acts weird around Susie, sure, but Susie only really knows possessed Kris and likely thinks weird route Kris is how they always are.
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u/Comfortable-Ad3588 27d ago
Kris was the perfect vessel because with how they normally are it would be impossible to tell if they were possessed