While I think there is no concrete answer to your question, I tend to suspect that person may be Daraman (the prophet) himself.
In the history of the Djinns we learn that previously all the Djinn were bad, until Daraman arrived and was the only one who could change his way of seeing the world, thus giving way to the separation (and war) between the 2 sides of djinns.
If you see it from that point of view, something similar happens to Goshnar, only one person (or soul) was able to make him change. However, as I said earlier, this is just speculation.