Sounds nice!
There are many yazatas in zoroastrianism, so there is plenty to pick from. They are mostly virtues and other abstract ideas, so you need to be creative when giving life to them.
There is also the Fravashis - guardian angels.
I think the common transliteration is 'druj'.
The evil spirits, deavas and yatu are led by angra Mainyu, the hostile spirit - ahura mazda's counterpart. The daevas are sometimes just any demon, sometimes the evil counterparts of the amesha spentas.
Here is a list of the seven daevas (seven since the spentas are seven in some traditions). They correspond to seven sins, but I'm not sure which these are (probably not far from the christian seven deadly sins). Aeshma, Akomayah, Indra, Nanghaithya, Saurva, Tawrich, Zarich.
I'm not sure about this listing, but aeshma at least is quite common. Aeshma is the daeva of wrath/fury.
Here is a zoroastrian page. Not sure how useful it is. There are quite many around.
http://www.avesta.org/avesta.html
http://www.avesta.org/angels.html
Mary Boyce has written several works on zoroastrianism. She might be a bit biased, as she is a zoroastrian herself. But that is probably not a problem in this case.
This summer I had an idea regarding a more developed zoroastrian LA splinter nation (part caelian) that was to be decidedly dualistic. I did some gathering of religious titles. I can probably find them again if you want them.