Sans thinks the human was tricking him with it not coming down here so he killed to make sure they do not gained any EXP and LV. But they did not come and he started the forget Papyrus. The way he sees him is boxes covering parts of his body.
Some names: faded reality/judgement/end Dark memory The remain of a faded try determinated for nothing The forgotten savior The remain of a end The faded savior Start of nothing (I will think in more names, and pls, dont heart this comment, i will probably edit again later, and when u edit a comment the heart leave, i will leave a reply in this comment if u will heart it).