Description
He exists.
He is real.
His name is Sans.
And he fell into the Core.
If Sans fell in the Core in place of Gaster in some disaster, I thought Gaster would fill the blank when it comes to Papyrus’s brother.
Gaster is the only person who knows Sans existed, trying to keep his memory alive by writing his name in the research notes, sketching him and memorizing stupid puns as much as he can, maybe because of the crippling guilt or out of respect to his fellow scientist colleague.