From online source:
“One early Buddhist text, the Samaññaphala Sutta lists the ability to create a “mind-made body” (manom?yak?ya) as one of the "fruits of the contemplative life". Commentarial texts such as the Patisambhidamagga and the Visuddhimagga state that this mind-made body is how Gautama Buddha and arhats are able to travel into heavenly realms using the continuum of the mindstream (bodhi) and it is also used to explain the multiplication miracle of the Buddha as illustrated in the Divyavadana, in which the Buddha multiplied his emanation body ("nirmita") into countless other bodies which filled the sky. A Buddha or other realized being is able to project many such "nirmitas" simultaneously in an infinite variety of forms, in different realms simultaneously.[7]
The Indian Buddhist philosopher Vasubandhu defined nirmita as a siddhi or psychic power (Pali: iddhi, Skt: ?ddhi) developed through Buddhist discipline, concentrative discipline and wisdom (samadhi) in his seminal work on Buddhist philosophy, the Abhidharmako?a.Asanga's Bodhisattvabh?mi defines nirm??a as a magical illusion and “basically, something without a basis”.[8] The Madhyamakaschool of philosophy sees all reality as empty of essence, all reality is seen as a form of nirmita or magical illusion.”—Wikipedia
We could understand from it that Buddha’s emanation cloud be anything from animate to inanimate as long as it that to benefit sentient being.
“And if an emanation is un-enlightened, does the emanation create karma?”
Or How do we tell the different between an enlighten and non-enlighten being?
When we understand “cause similar to result and result similar to cause” and by examine the result we could inferred its cause. If the result was alleviating sentient being of their suffering and brings about lasting happiness through wisdom then we concluded that the causes must be of enlightened. Hence, it would be very clear that it will not accrued any karma as mind stream of an enlightened beings was known to transcended that.