Loki's probably free for rescues- or for disguises, for crews going on rescues. But unless it's one of about three people, he'll need to be asked.

He can also teleport people to/from the surface, and he'll probably be offering that via a network post at some point- along with weapons.

I'm over on mavari if you want to handwave knowing to ask him; I don't bite, but I do ramble about comics, so you know.