Love the idea of him losing an eye and gaining raven familiars to scout and spy through (maybe the eye he "lost" actually looks like a raven eye when it opens if it's not missing outright) with the potential for lupine or Sleipnir-esque familiars in the future. I also like the idea of runic magic, too, if that's not too much.

As far as quirks go, he has an Archive beneath the Bin, so him building up a new Archive, gathering and hoarding information would work for him. Particularly if he's using what he can spy through his familiars to add to it all if not give him the locations of stuff to gather for the Archive.