Which ‘dead’ character could return? (Spoilers)

Over the course of the first three books a small number of ‘dead’ characters have turned out to be alive. Brennan, of course, as well as JFB but also Berwyn and at least one wyvern come to mind as examples. Even those returning from Resson were added to the death roll so this isn’t an unimpeachable source.

In a world where time can be stopped- temporarily- anything is possible after all.

So… two part question. First, which ‘dead’ character do you believe will return and second, which potential resurrection would be the most mind-blowing?