loki is a good comparison, both the marvel and norse versions; but really fen'harel is mostly a generic trickster trope. playing every angle to benefit himself, and those he protects, or manipulates.
tricksters are the best gods though, so much more colorful, and amoral.
the lokis are good examples in classical mythology (yes plural), or even a good written John Constantine (yes i know, he isn't a god, but the trop remains); or a great private detective setting all of his suspects against one another.
fen'harel is there to change the world, but we do not know for what reason.
sorry if this makes no sense, i just woke up