Personal headcannon of mine is that Toriel is proficient in karate , kick boxing , boxing , mma , and combat with weapons and she also had mma and boxing careers that she just only uses when someone threatens children
Suselle but Susie tells noelle and her family about her home life and shows her scars from the abuse her parents subjected her to ; with carol breaking almost immediately as she cries she and rudy promise to protect Susie from whoever may hurt her