Hey, thank you for participating, they are random.. here is the code:
https://github.com/PixelNoob/python-steem/blob/master/scripts/chibi.py
As you can see I access the Chibi API and get a random chibi using the random module:
chibi_number = random.randint(1, 850)
Good Luck!
Ah, very nice! Great to see the API in use.