I think the Loki idea could be great fun... particularly since we already know Odin's still kicking around.
I had a player who hadn't yet read any of the books come to me, very early in play, and tell me how he'd like his character to develop... first, multiple forms shapeshifting, then freeform (animal only, possibly human), then some limited magic, and last, he said... is there any way he could pick up the ability to eat magic?
He'd also left his childhood a blank slate for me to play with. Since he'd essentially just described a naagloshi, I decided to run with it, since the books describe there being two kinds of them: True Naagloshi (the immortal sort-of-fallen-angel-but-native-american), and the skin-walkers, who were just humans who learned from a naagloshi (very long lived, but not truly immortal).
His parents had once helped a shaman bind a true naagloshi into a prison- a tree, think "Running w/ the Demon" if you've read it... and were responsible for keeping the bindings up... he followed them one day, and the naagloshi was able to touch his mind. He got a new imaginary friend who taught him all this stuff, and he eventually wore the binding thin. It broke out, killed his parents, and left him. As he's started remembering what happened, he's also started remembering the talents the naagloshi taught him before it broke out.
It's been... interesting. We've barely gotten started on the freeform shapeshifting, and let me tell you... if you want this to be a support role, it might not be the best idea. Sure, you can fill in wherever the group needs help... but even with only 4 points, you're looking at being able to handle just about anything you want. Be careful not to relegate any other players to back-seat positions because of your "Jack of all Trades, Master of whatever-needs-done" build, and you might be fine... but it's worth keeping an eye on.
To be honest, I might recommend playing something a little more knowledgeable and a lot less powerful- provide a link for the players into the world without even being able to carry them through it. White-Court Virgin who refuses to give in or even risk it (cause what if they don't love me too?).