@silverskye13 YOU CALLED?
Normal gaster with a mask but then mainly full out hk wasp gaster with a mask, specifically a bald faced hornet.
Skye I want you to know that because you made this comment, @ginger-goats-galore and I came up with this whole storyline for hk!gaster, which basically is gaster was working on the vessel project and volunteered to let them experiment on his body once he died (and since he was on a time limit, pk, ah, hastened the process). So post death he was kind of resurrected via void, losing all memory of his former life, but still continuing to work in the vessel project per the commands of the king. But eventually he starts to doubt the morality of the project, and once the first batch of vessels die, he runs off with a small egg of twin vessels, which contains ghost and thk.