I know you haven't read Magnus Chase, but I was wondering about something. So according to timeline, Natalie died sometime and Magnus became homeless sometime around botl. Annabeth and Frederick didn't know about this for two years. Do you think something would have changed if they became aware of Magnus situation and he came to live with Frederick after Natalie's death?
At minimum, I think Annabeth now would have at least one supportive person and wouldn't feel so isolated.
You know what I think would be funny? He comes in as Luke is in the middle of trying to persuade Annabeth to run away with him. It's after Botl since I kinda doubt Annabeth and Fredrick could really be answering any phone calls during her kidnapping. It takes him a couple of months to make his way to their house. It's the last safe place he knows, the only uncle who hasn't tried killing him
He's roughed up and messy but surely they'd at least give him some help. So he's about to knock when the door slams open to an angry and mean looking adult storming out. Behind the guy he can see Annabeth shouting at Luke to leave and how could he ask her to run after apparently kidnapping her?? Alright. It seems that she didn't get an easy life either. Anyway he should make a good impression
...yeah the whole Annabeth and Luke conversation gets very messy with Magnus overhearing a bunch of things without context. A little while later, she sits him down with the mortal version of events. I do think Magnus's presence causes Annabeth to bounce between camp and her father's house instead of her completely going to camp for the war efforts. Magnus has 0 idea of any godly world at this point either so I don't think her or Fredrick would tell him anything (although with him staying in a single place, his other uncle would probably find him much faster. So his story gets speedrun)
So unfortunately I don't think Annabeth would completely confide in him due to all of the godly world stuff she'd have to juggle. Although I do think she'd talk about her complicated relationship with Luke after what he saw. And how Percy's action has been affecting her because that's a safe mortal concern as long as she fibs a little
Generally, Magnus actually gets the greatest impact as his uncle can track him down easier. Annabeth now has someone where she can confide some of her worries to, especially since the main person she does so has now become the reason for some. She does also understand Percy and gives him a little more grace now that she sees how someone (near their age) outside the war helps. (There could be a funny side plot where Percy gets jealous as she keeps worrying about Magnus due to Luke knowing about him + disliking him and forgets to explain that they're cousins)
