So uh.....Imma talk about sans. OK? Mr. "Lazybones". No, I'm defending Sans is Ness.

It is my belief, that Sans....is a nihilist. A severe nihilist. Think with me for a second.

He knows about the timelines. About the GENOCIDE, PACIFIST, and NEUTRAL! He's lived over them all! He's seen his brother die.....thousands of times. He has probably died thousands of times! What we perceive as laziness from Sans could be his nihilism. He just.....doesn't care anymore. But everytime you kill his brother, it sends him over the edge, over and over and over again. Imagine the effects on the psyche.

This is why I believe Sans isn't lazy, he's Nihilistic. His SPECIAL ATTACK can be seen as a form of that Nihilism. Its literally....nothing. Just him, What do you think?

Isn't his special attack the thing he leads off with? Hence why he says something about why people don't lead with them in fights?