Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-27327020-20160405111924

True.

Blooky, mad dummy, and maybe Mettaton, are technically Ghost, although Mettaton is ghost fully merged with that machine. Although they dont possessed the same type of Immortality as powerful reality warpers can still wipe out their existence from reality.

Characters like Asriel (God Of Hypedeath, and Angel of Death) and Frisk have perfect immortality. Frisk is determined to the point where he cant ever die and Asriel due to the fact he has achieved over all aspects of life, death, dualism, reality and existence, he is technically not bound by death as well.