Hello! If AU/memloss isn't a hard no, might I offer savetheearth? Characters are reincarnated as normal human beings and regain powers/personalities/physical traits etc through interaction with each other and the main plot.

It may be faster than what you're looking for and the AC takes four threads with four different characters. But everyone I know is pretty backtag friendly and while it's often slice of lifey for stretches, there's a strong metaplot going on.

We have a growing Tolkien cast - Glorfindel, Kili, there's a Fili and a Thorin with apps pending and a Thranduil app being completed now.