Board Thread:Questions and Answers/@comment-28926267-20160706032249/@comment-5956954-20160825131516

I remember the time when Alphys experimented with extracted determination from the "human SOULs" that accidentally created the amalgamates... which I believe was around the time she was a royal scientist... because Gaster died........

It's pretty simple from the evidence we have gotten. However, even what I say would be theory.

Gaster was killed in his experiment. Nuff said. Who knows what this experiment truly was. Maybe it distorted his body. Maybe it scattered him across time and space, so parts of his very being, both physically and mentally, exist as entities like the ones we see, giving his visual appearance a distorted and somewhat incomplete look.

Either way, he is not an amalgamate imo.