I kind of like the idea of a fire kitsune. Since Kira's mother is kind of fading out of her kitsune powers, it would be interesting to have a different kind of kitsune around. But I would welcome a chance to bring in a totally new supernatural creature. I read up a bit on Phoenix powers and certain mythology has them being able to survive any type of death (immortal) and then being reborn through fire after at least 500 years. This could work with Parrish surviving the fire, but not regenerating. The Phoenix is also considered a protector and if asked properly, it can grant requests / wishes. They are also protectors, which is in keeping with Parrish being a peace/police officer. In some cultures, they can also have a dark side if pushed, but they are generally benevolent creatures that are there to help and protect.
Also, in the Marvel Universe, the X-Men character of Jean Grey is also considered a "Phoenix" (after her run in with the Phoenix Force). So more interpretations.
I'll try to find the link where I saw these more interesting descriptions of the Phoenix.
