Annabeth Chase
Annabeth Chase would NOT be content with a normal, everyday life. Yes, she has Percy, yes she has her friends, yes she has her dream job, her dream home, but she does not have the adventure, the adrenaline rush, the spark in her blood as she spots a monster hiding in an alley.
Annabeth Chase craves adventure. The girl ran away from home when she was SEVEN. She has been waiting and training for years to go on a quest. She wanted to lead one too. And even after the war with Gaia, even after the trek through Tartarus, she was ready to help Magnus with his quest. She wanted to help. And I can bet you anything that the moment she got back home after Magnus explained everything, she buried herself in books about Norse Mythology.
Unlike Percy who is shown to want a more peaceful life - lightning thief starts with ‘look, I didn’t want to be a half-blood’ and the iconic ‘why?’ when Apollo turns up in ToA - Annabeth needs battles, needs quests, needs to train and to sharpen her skills all the time. Yes, a life growing old with Percy and her children is what she would give anything to have, but along the way, she would not settle for normal. She would always be there in CHB or CJ, volunteering for quests or tracking down some particularly vicious monsters or helping younger demigods reach camp safely.
Furthermore, she’s a child of Athena. The desire to learn more, to develop and enhance herself is in her blood. Remember the time when she picked a fight with the Sphinx because she was being quizzed on facts and general knowledge when the Sphinx was actually supposed to ask her riddles? It annoyed her that the questions she was asked weren’t making her think.
tl:dr: Even if Percy might be willing to slowly let go of his demigod self*, Annabeth wouldn’t.
*and by that I mean, he would be a mentor in the camps and an excellent sword fighting instructor. And he would obviously help in any way he can when he has to, but I’m saying he wouldn’t particularly enjoy another life threatening quest. He wouldn’t crave one like Annabeth would.