Oh my god I could go on and on about this question. I will try to keep it as short as possible. Basically, I just love how deep their relationship goes. There are so many things about them that makes them such an incredible pairing to me
1. There is so much mutual respect and support between them. They are battle partners. They respect each other's strengths and capabilities to the highest degree. Annabeth deeply values Percy's bravery and loyalty, while Percy deeply values and admires Annabeth's intelligence and strategic thinking. They support each other no matter what. No one respects Annabeth more than Percy, and no one respects Percy more than Annabeth. They trust one another explicitly. And that deep-rooted trust and respect is what separates them from so many other pairings.
2. They perfectly complement each other. Their contrasting personalities balance each other out so beautifully. Percy is impulsive and unpredictable, and Annabeth is thoughtful and strategic, which makes them an incredibly strong team. In any situation, whatever one of them lacks, the other has in abundance. Percy gets angry and worked up easily, but Annabeth can calm him down. Annabeth overthinks things and stresses herself out, but Percy can simplify things and bring her back down to earth. They keep each other level on a deep mental/emotional level. And the biggest one, in my opinion: Annabeth’s biggest fear is being betrayed and abandoned, and Percy’s defining trait is unwavering loyalty. They are like two different puzzle pieces that fit perfectly together.
3. They’ve been through so much togeher. The two of them share a history that no one else could possibly understand. They have learned and grown so much together. They started going on dangerous quests together when they were little baby 12 year olds, and have been fighting by each other’s side ever since. From going on quests, to being part of a prophecy, to dealing with the complexities of their identities as demigods, the challenges they’ve faced have impacted them both tremendously. And no one else would understand exactly why they’re the way they are. And you know, there’s the fact that they literally walked through hell together. Their experiences deepen their connection and understanding of each other more than words can describe. No one else could possibly understand them like they understand each other.
4. The chemistry is off the charts. The heat and attraction between them is abundantly clear, which adds a layer of realism and excitement to their relationship. In PJO it’s mainly tension - that’s clear in their banter and arguments and angsty thoughts - but when they’re older and together, it’s shown more through attraction and physical affection. Let me give some examples. When Annabeth touched his back in TLO, Percy says he feels as if jolts of electrify course through his body. In the demigod diaries, Percy mentions how beautiful she looks while in combat. There’s also a scene where he can’t focus because he’s literally staring at how her camp beads lay against her throat. Annabeth is constantly wanting to hug him and be in his arms. When she sees him in MoA, she literally has to restrain herself from continuously kissing him. And when they are about to fall into tartarus, to either death or torture, her dominating thought is how handsome he looks. Throughout all of HoO, they are super touchy and affectionate with each other, always touching and cuddling and kissing one another whenever they can. And of course, I have to mention the time that they literally made out in front of Piper in BoO, and Annabeth makes “grunt-whimper” sounds. I just love how down bad for each other they are. No one who can read can deny it. There is so much heat and attraction and affection between them.
5. Their loyalty to each other is unwavering. They consistently prioritize each other's well-being over anything and anyone else. They always have each other’s backs, both in battle and verbal interactions. They quite literally go across the country/world to find each other when they each get kidnapped. No distance, no person, nothing will stop them from finding each other and protecting each other.
6. They are equals. Given they are both legendary greek heroes who will go down in olympian history, it’s hard to find someone who compares. But they are both so equally extraordinary. Sure, they have different strengths, but neither is better than the other. They are both incredibly brave. They are both super witty. They both would do anything for their friends. They are both leaders. They just GET each other. They are on another level - and it’s the exact same level.
There’s more too. I could go on and on and on. (And on.) There is so much I didn’t say. But all of those elements combined is why I love them. They were made to love one another. They choose to love each other, every single moment of every day.
And my favorite thing? Probably that above all, they are best friends. There are all the things I mentioned above, but at the foundation of their relationship is an unwavering friendship. They just love being together. They love joking around together and hanging out, but also holding each other when times are rough. They take care of each other. I love that they are BFFs. Two besties who also happen to be soulmates, together against the world.
Ugh I just love them. I need to stop talking