Jeremy, you know, and I know, anyone you’re stuck with in a room for a lifetime, however cute, however intriguing, however chill, you’re going to want to kill them after a year, never mind a lifetime.
So you’re off the list.
And what would drive you insane is being stuck with the same soul day after day; but I’ll take a shapeshifter, so at least I’ll get some visual novelty. Proteus, for instance?
What? No deities?
The question said I could raise the dead; bring a deity along shouldn’t be that much more of a stretch.