Board Thread:General Discussion/@comment-32182236-20190920194329/@comment-32182236-20190921121316

Try naming a point in time where Chara encouraged you NOT to kill in Pacifist. Chara's said Free EXP (Monster Kid) Keep attacking (Sans), but when did they say that you SHOULDN'T kill?

The closest you'll get is Toriel, where they ask IF you can, never saying that you should, or even hinting that it's worth it, or NOT worth killing.