Definitely the moment when they are pronounced husband and wife. There would be a huge cheer from all the guests, who are a mix of demigods, gods (if they decide to grace the occasion), and their mortal friends. And then, the wedding reception. The food would be a mix of Percy's favorite blue treats and Annabeth's more refined tastes. They would cut the cake together, and it could be a cake shaped like the Camp Half - Blood or something that represents their journey together.
Well, the moment when they exchange rings would be really memorable. The rings, which could be something with a special meaning related to their demigod lives, like a small trident or an owl design for Percy and Annabeth respectively. Also, the speeches given by their friends like Grover. He might tell some funny and heartwarming stories about Percy and Annabeth's relationship, making everyone laugh and cry at the same time.
One memorable moment is when Percy and Annabeth fall into Tartarus together. In that extremely dangerous place, they rely on each other completely. Their love and trust for each other are really highlighted. Another moment is when Percy gives Annabeth his invisibility cap to protect her during a battle. It shows his selfless love for her.
One special moment could be when Percy first sees Annabeth in her wedding dress. His eyes would widen in awe and love, and it would be a very emotional moment for both of them. Another could be during the exchange of vows. They would pour their hearts out, talking about all the things they've been through and how they will always be there for each other.
Well, it could be the moment when their closest friends give speeches at the wedding. Ron might share some hilarious and heart - felt memories of Harry and Ginny, and Hermione could give a very intelligent and touching speech about love and friendship. These speeches would add a lot of emotion and laughter to the wedding in the fanfiction.
In some fanfiction, a really great moment is when they finally confess their feelings for each other. It might be in a beautiful, quiet place like on the beach at sunset. The build - up of all their adventures together and the unspoken feelings finally coming out makes it a very special moment. Also, when they dance together at a camp - half - blood celebration. They might be a bit clumsy at first, but then they find their rhythm and it's a sweet display of their relationship.
One romantic scenario could be on a beach at sunset. Percy takes Annabeth to their favorite beach spot. He has set up a small picnic area with all of Annabeth's favorite foods. As the sun starts to set and the sky is painted in hues of orange and pink, Percy gets down on one knee. He holds out a ring that he made himself, perhaps with some help from Hephaestus, and tells Annabeth how much she means to him and that he wants to spend the rest of his life with her.
A heartwarming moment could be when Annabeth surprises Percy with a scrapbook she made. It has pictures (drawn or magically captured) of all their memories together, from their first meeting at Camp Half - Blood to their latest adventure. Percy would be really touched by this as it shows how much she values their relationship.
It could be about a beach vacation they take together. Maybe they're on a quest that leads them to a tropical island and they end up wearing bikinis and having some fun and romantic moments on the beach.
One memorable moment is when Percy and Annabeth hold hands in the face of danger. It shows their connection and how they rely on each other.
One memorable moment could be when they kiss after a dangerous battle. In some fanfictions, they finally give in to their feelings in the midst of the relief of surviving a life - threatening encounter. It's a moment of passion and vulnerability.
Their wedding could be a grand affair by the sea. Percy would surely want it near the water, and Annabeth would plan every detail meticulously. There would be blue and grey decorations everywhere, representing their respective elements. Their friends from Camp Half - Blood would all be there, and Chiron might even give a speech about their journey together.