Double post, yay.
I finally found a way on how to get an NPC-0.
So all you need to do, is to place an empty Herb in a level:
Then grab it:
And vuala, you got it!
As a proof, after that small experiment, I decided to test this NPC with LunaDLL. Here's the code I used:
NPCMemSet,0,0xE2,1,0,0,w
It will change NPC-0 to NPC-1 (to SMB3 Goomba).
And here's the result, after I grabbed it, even with the custom graphics, it's empty (invisible), but when I kicked it, Mario stomped it immediately and its effect was seen (if I remember correctly):
So um, yeah. Maybe I will test it with Koopa Troopa and some other NPCs too, later.
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<Knux> h2643 the super computer
redigit_is_cool