tbh the idea of immortal character's personal growth is interesting and doesn't seem to be explored enough
I mean, how many times have we seen an immortal character drop the whole "actually I'm several hundred years old" bombshell, and they still act like the exact same person they were at age 20 or whatever. how many people do you know who are still the same as they were even just 10 or 20 years ago? yet somehow eight lifetimes came and went and had no impact on this dude?
Give me immortal life stages. Give me
millenia old characters poking gentle fun at someone who's 200yrs old and in their edgy 'brooding' phase.
midlife crisis immortals who just got bit with the 'what am I doing with my life?' bug, who suddenly feel like they're wasting their gift and they need to be making the most if it right now
you know what, I want an immortal who keeps having weird skills/knowledge, and everybody assumes they've got this big elaborate backstory because of it, but no, it's just all from that one fifty-year span where they decided they needed to learn how to everything or else they were wasting their potential
immortals who have changed their stances and opinions on issues but now there's callout posts for things they said in letters to their friends a hundred and fifty years ago, like yes @cumberbatchcockdongle, I am sorry I said transphobic things about the bearded lady at that circus in 1872, please kindly forgive me and/or fuck off
characters going through the eternal cycle of whether loving mortals is worth the inevitable grief. the answer always depends on how recently they've been bereaved. just a merry-go-round of 'better to have loved ans lost' versus 'shitfuck grieving hurts I'm never doing this again'
super laid back immortals who have lived through so much nothing phases them, and sometimes they have to be politely reminded that things do not always 'work themselves out' for mortals