Kris is canonically a spastic
>deadpan voice
>weird, zombie like movements (that's how he normally is)
>communication disorder
>awful grades, sleeps during classes, bad at sports
>his mother has to drive him to school and take him by the hand to the classroom
>Noelle only became infatuated with him because their parents were friends and their siblings dated
>picked on by the school bully because he's too retarded to fight back
>everyone knows him as that "weird" kid

Deltarune is actually Quantum Leap
https://m.youtube.com/watch?v=kav7tifmyTg&pp=0gcJCf0Ao7VqN5tD