Each Robot is made up of 6 sets of 10 choices each, plus backgrounds.
It's not perfect, but it's enough to give you a basic view into "Is this the same guy or not"
So it works well for a simple signal (which is the goal), but shouldn't be relied on if people might try to abuse it.
I could have made up more Random elements, but that'd take more time/money, which isn't worth it unless anyone outside of me actually wants it ;)
I wonder if you could get better results using a markov chain to generate english prose from a large sample. If you take the top N next word options, and select one based on the next log_2(N) bits of your hash/key, you lose no key space and should get a nonsensical but perhaps easily remembered string.