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•Percy and Isha are invited to spend weekends or just time at Atlantis after the war. It's basically like the divorced parent setup. Amphitrite more or less just treats them like her own kids (taking Poseidon and Amphitrite as an open and poly relationship) and Triton and Percy probably managed to settle their differences into a healthy sibling rivalry.
•Atlantis holds the Isthmian games annually to honour Poseidon. Here's some bg info about them:
So the Isthmian games were kind of like the Olympics in ancient Greece and done to honour Poseidon. They usually consisted of a lot of athletic events like boxing, wrestling, pankration, chariot racing, footraces, the works. They also had musical events and poetry recitation or like stuff related to the arts as a part of the events. Okay back to the actual headcanons.
•Percy & Isha 'Poseidon's junior sea scouts' probably participate and wrestling and fighting aside, at heart these are two dramatic theater kids who go all out in the singing stuff. I know they would be the kids to pretend to make YouTube videos. They would probably introduce pop music to Atlantis and do high level musical ass productions with diy props. People genuinely find them entertaining as hell.
•Atlantis probably singlehandedly revived ABBA in the modern day (tbf Abba is timeless) after this
•Poseidon views them in a very Stan with Mabel and Dipper way (Gravity falls).
•The power of siblings is that other people find Percy and Isha so incredibly terrifying and larger than life but they view each other as the person who shoved breadsticks up their nostrils with you at 3am.
•Isha is one of few people who will never be convinced Percy is dumb. She'll call him stupid all the time especially when he acts it (they're siblings no ones oveetly nice to their siblings) but she does not think he's actually dumb and will fight anyone who does, even Percy himself.
•They've definitely questioned whether they can eat fish/seafood. Percy is filipino and Isha is bengali, they consume a lot of seafood. Percy probably asked his mom after tlt at a random dinner. Isha asked Percy midway through eating gas station sushi.
•Isha's also 100% a girl blogger and would definitely make silly videos like "rating all my opps based on how easily I destroyed them". She probably vlogs the most chaotic things ever with her menagerie of pets (Mrs. O'Leary, street cat Mochi, Bessie, Chb pegasi, undiscovered marine species in the nightmare zone)
•She totally enchants all her belongings which she carries everywhere so they don't get damaged or lost if attacked
•When Percy disappeared after TLO, Annabeth probably got haunted by Percy through Isha. They look similar enough to be mistaken, she grew taller and was always cutting her hair and they were just so similar. She probably found it hard to even look at her friend sometimes.
•Percabeth give Dick Grayson and Barbara Gordon vibes while Isha and Annabeth are Kara Zor-El and Barbara.
•Poseidon loves his kids like hell but he's lowkey a girl dad. He's the proud of their strength but a bit more rough with his sons. With his daughters? Would probably think of them as sweetheart meow-meows while an island drowns in the background
•Percy is such a mommy's boy. He has a complicated relationship with his father but does love him and gets closer to him after the war. Isha loves her mom so, so much but is def a bit of a daddy's girl. Goes googly-eyed at praise from her dad.
•The two of them probably got chlorine damaged hair from being in the pool too much. The sea always fixes their hair at once though and regular water fixes it to an extent.
•Percy would sound like Telemico as he's getting into puberty and would get duper annoyed at how much his voice squeaks and breaks. Once his voice actually matures he sounds like Mark Grayson (Invincible). Isha sounds like Korra and her voice gets deeper when she matures like Korra post s2 or a little like Mizu from blue eye samurai.
•Those two probably wanna try and get into one of the dark knight movies so bad (they film in New York).
•They are both 100% kajol (kohl) on the waterline and mehendi (henna) on their arms people
•Both Percy and Isha agree autumn is the best season and summer is a close second. Isha is super serious about Halloween too. The type to make all her costumes by herself and choose stuff she genuinely loves rather than generic things. She'll happily make the entire family's costumes and has a strict trick or treating routine.
•Percy is particularly apprehensive of grown men which stems from Gabe's abuse. He's the type to be incredibly wary anytime he's in public with his mom or sister and his suspicions of Paul never quite left him.
•Isha is that one bitch with monumental amounts of self-loathing and a god complex simultaneously clashing in her head.
•She hallucinates Bianca when she gets into really dire situations which is a real thing that can happen from about 15-40% blood loss or more than 40% (its either one of these)
•they celebrate cultural festivals within the community of poc around their neighbourhood.
•Percy upon finding weird ass brainrot ahh bengali nursery rhymes periodically sends them to Isha and writes the lyrics on text with no context ful chest (this is for the niche audience who know in their soul what I'm yapping about). She leaves him on read and has him muted.
•demigods have really irregular periods because their extreme physical training and activities affects their cycles (look this up, I'm not explaining biology here)
•Percy is quite a meat enthusiast (in the same way Sokka is) and Percy and Isha consume a lot of meat too especially with barbecue at Camp. They're vaguely biologically ocean predator adapted so the sharp shark teeth for meat and the digestive system for it.
•Sally THE GOAT Jackson cooks all the Indian and bengali dishes alongside Filipino food so that her kids don't lose their culture.
•Isha will always think of herself as an outsider. Even with her family. No matter how close she can get to them, she'll always think of herself as intruding especially with Percy and Sally. She knows how close they are and how much they've relied on each other to survive and doesn't believe they'd love her like that. She's not bitter about it, just accepting it as fact in a sad way. It's the same with him and Annabeth. She knows they've known each other longer and just doesn't believe she'd be loved the same amount.