What is a Proto-Zerom?

And is there a canonical way I can turn Kohaku into one?

I'll get back to you later today, I need to consult which kind that is I'm mixing them up in my head @.@

EDIT: I checked through the script and I honestly don't know, sorry to be of absolutely zero help D:

If you mean the

Spoiler:

then those are failed larva buds, you could have one combine with someone if they were still active/alivey

If you mean the Ex-boss of the original, I never got a translation for what exactly was happening with that, sorry again :C

Sad Aboo is sad.

But hey, I guess that frees up more time to work on my Castlevania Pachinko fanfiction.