I like this Idea and I'm plenty interested. Sounds much like the show Forever, except, well you're not a singular immortal being, but several beings who were/are plenty mortal. The identity crisis is what really sells it for me. While the personality being 'constant' is a little hard to work around (because relationships with other characters *if any*) but I think it would work since physical change would mean that if a character died and came back, there's much less of a chance they'd recognize each other again, not to mention age differences between the time they died and how long it takes them to come back to life. (immediately reborn? A year or three?)