I was going through all the stuff I've written on paper to file it in a binder, all proper and in categories. And I found some old HC I wrote when I was fifteen and bored out of my mind in physics class. So here goes :D
The parts in italics might be triggering fyi !
when she first arrived in Camp Jupiter, some people from her cohort tried straightening her hair. She hated it.
he has a bracelet with a silver bow as a pendant that he never takes off. It's to keep his sister close to him.
it takes some time for him to become a better ally. He listens and never judges, tries to understand and all, but he does take a while to start actively correcting people (like when boys tease each other with no homo etc). He gets better with time, but it's a learning curve.
he grows his hair out. The military cut reminds him of Camp Jupiter, of his responsabilities and of a boy he doesn't want to be anymore. He has beautiful hair because he asked Piper for tips (even though he has much thinner hair than Piper).
he speaks Italian in his sleep.
he has so much internalised homophobia; he hurt himself over it.
he is asexual but says he's gay because it's easier, and he isn't sex repulsed, so it's too much bother to come out (in his mind).
he loves Hazel's hot chocolate because she adds so much cinnamon it's just divine.
he is very modest/prudish. He always sleeps in PJs and doesn't swim in front of others. His aviator jacket is his armour against the rest of the world, to shield him and hide his SH scars.
he doesn't really say to people he's Italian. There's too much racism going around.
he tried reading the comic Cherub because the setting reminded him of his life, but he couldn't go on because the protagonist is a misogynistic piece of shit.
when Jason started growing his hair out, he did the same, because brooooooo. Except he doesn't really take care of his, so they are crisp because of the salt (and he uses a 3-in-1 shampoo, which doesn't really help).
he is afraid of needles, but he got two tats: one for his mother and one for the seven. He will however never get percied anywhere.
he loves man buns (while Jason is more of a braid type of guy).
when he has trouble studying, he puts his flashcards in hermetic bags and goes to take a dip with them. It works a bit better.
every year, for Tyson's birthday, he bakes him a peanut butter cake. He insists on doing it alone, and it's really good now!
his favorite fruit is kiwi.
Annabeth often put her hands on his lower back to sooth him.
now that his hair is longer, he sometimes plays with it when thinking. Piper finds that hilarious.
he doesn't like wearing sunglasses (they remind him of Ares/Mars too much). But, after a long afternoon spent on a boat, he got himself nasty conjunctivitis. Since then, he puts some sunglasses on when going to sea.
one day, he'll go rogue. He'll turn against the gods. He'll look in the miror and see Luke and nod because yeah, maybe Luke was right. This day, he'll lose Annabeth.
he doesn't have any towels in his cabin because he doesn't need them. The first time Annabeth takes a shower over it's a whole thing.
he is a fan of Hong Kong martial arts films. He shares that with Leo.
he is a little spoon because of his Achilles heel.
Percy, Annabeth and Leo are team Iron Man. Jason, Nico and Hazel prefer Captain. Frank and Piper, being the persons of taste that they are, love Black Widow. (Reina secretly likes Thor, but he reminds her of Jason a tad too much.)