Board Thread:Questions and Answers/@comment-34974603-20190406202753/@comment-38364716-20190804164436

Here i go:

Mettaton EX and Mettaton NEO Can be killed because they have a coporeal form

Mad dummy has not fully fused with his body, SO he can not be killed, Only can be killed in the Genocide route.

Napstablook has no coporeal form, So he cannot be killed regardless.