The extent to which Sans' life has been toyed with is unknown. But in truth, it does not matter, as it's an inevitability with no end in sight. Such a reality makes it easy for a monster to lose hope. Perhaps it already has. Regardless, Sans will keep fighting. Not for him, but for those who can't.

(For this role, all that's recommended is a deep voice of some kind. Feel free to have any accent you want, if any!)