"Gentleman cambrioleur"

This is a hideout of a criminal — but he already ran away.

After some time of profiling, the policeman finally drew a conclusion:
"This criminal must be a [   ?   ]"

Answer:

*The original version (Japanese) was made by Nao Fénix.

The answer is a single word with less than six letters.
It doesn't mention nationality or gender.
I'm not sure whether this profiling is really helpful
(or rather, I am sure it isn't)...
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