@Sharonia yeah, I've made mine immortal as well. I'm going with the idea that spellcasters in general live longer, and Sages in particular don't age at all. If they ever relinquished the position, they would start ageing normally again.
@Sindocat I changed L's name to Elle, haha. Keeps the pun and is, you know, an actual name. Your Sim's friendship with Simeon seems sweet!
@mcrudd oh, your triplets are cool!
@Nindigo Simeon seems like he'd be good with gardening! As for the laptop, I think that's the geek trait coming through, haha.
Okay, for my own! Morgyn has become one of my favourite Sims ever (the, uh, icon probably gives that away), so they have the most elaborate backstory. For the others, it's relatively simple:
Ethren, former Sage of Practical Magic, retired to focus on his art and music. He's still a virtuoso spellcaster, but mostly just uses the practical spells to help out around the house and isn't really into magical politics any more. Honestly, it was a relief to be free of it. He's also now an elder. Simeon (who I originally made over to look like Ethren, then de-made over to look like a madeover version of his original, in-game look), who was a tech-head who mostly used practical magic as a substitute for sleeping, showering, and eating while he was in the midst of a computer binge, was kind of unimpressed to be designated the position, but he also has an intellectual curiosity in how the Realm fares and so sticks with it.
My madeover L still looked distinct enough that I didn't need to remake her. Mischief magic has a particularly odd line of succession - where practical magic relies on heavy training and untamed magic is instinctive, taking the position of Sage of Mischief Magic involves tricking the former sage. When L finally got the better of Keisha, the latter happily stepped down and granted L the position. Keisha has been remade a virtuoso spellcaster and aged up to elder as well, and I replaced her self-assured trait with goofball.
Now, Aine and Morgyn! First, Aine is keeping that name, but 'Tess Dyer' was her former self. When she had first arrived in the Realm from an unhappy life, she remade herself entirely, renaming herself, cutting off all semblence of her former life. She became Sage and served with Ethren and Keisha, and when Morgyn arrived, they very quickly became her favourite student.
Morgyn had an unhappy background, and was pretty depressed when they came across the Realm. Finding magic was like coming home for the first time, and Aine became both their beloved mentor and almost a parental figure. They were both ambitious, both incredibly talented spellcasters, and both outsiders who had made the Realm their home. Morgyn very quickly rose in the ranks, befriending fellow students Grace and Tomax (and having a friendly rivalry with the latter), and it wasn't long before Aine was declaring Morgyn her future successor.
Unfortunately, it wasn't to happen the easy way around. Morgyn (as seen in the first trailer) got a little too ambitious and, in a duel with Aine for knowledge, ended up dying of overcharge. Aine was heartbroken and determined to revive them, bringing them back to the HQ for the revival ritual. Grace, who was Morgyn's closest friend after Aine, volunteered to help, and they set about to bring them back.
And this is the point where the fracturing Realm comes into play. Normally, the ritual would involve the one doing the spell using their own life force and magical essence to 'jumpstart' the one who was being revived. But when Aine was in the midst of this ritual, the connection was severed by the unstable Realm, and all of Aine and Grace's magical potential and energy snapped into Morgyn, instantly reviving them and giving them the position of Sage of the Untamed.
The effects on Aine and Grace were rather more drastic. They reverted to the people they were before ever coming to the Realm, losing all magical power and their memories. For Aine, who had been in the Realm for decades, this had a far greater impact than on Grace (who only lost a year or so), forcibly turning her back into 'Tess' and sending her into a coma, to boot.
Grace was able to be revived. Tomax took her home, and when she was ready, she returned to the Realm. Morgyn remade her into a spellcaster and has been teaching her the magic she used to have, working on a way to restore her memories - if they can help Grace, they can also help Tess, who is in far worse shape.
And, uh, that's a small novel, sorry about that.
Short version, Simeon got a makeover again. He and L are Sages and aren't doing a whole lot, although L does show up at parties a lot. Ethren and Keisha are happily retired elders. Aine/Tess technically isn't in-game, although I plan to introduce her later. Morgyn is working feverishly to restore Grace's memories and bring Aine back, and in the mean time, they've also befriended my main and have started a slow-burn relationship with Caleb Vatore (who first came into the Realm seeking a cure for vampirism, it's complicated).