Toriel: 4/10 pained me to kill her
Papyrus: 100000000000000000000000000000/10 pain to kill him
Undyne: 2/10 pain to kill her(SCREEEEEEEEEEEEEE-)
Mettaton NEO: 1/10 pain to kill him(he never really grew on me)
Sans: -1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000/10 pain to kill him because I know it's gonna take me forever to beat him.