The Athena Cabin basically just adopts Peter as one of their own. Since Peter's "Godly Parent" doesn't have a cabin and isn't even Greek or Roman, he has nowhere to stay in Camp Half-Blood so Malcolm invites him to chill with them since they have pretty similar powers (The powers part being inspired by this post by @/demigods-posts)
Wanda and Hazel are like the best of friends and they spend hours watching old horse movies and cat videos together. If they're not with the main groups, they're definitely holed up in Wanda's room. Vision and Frank are allowed to join them but honestly get ignored and shushed most of the time
This is honestly just canon atp but Apollo is Nico's number 1 fan and he's constantly hyping him up during visits
Thor and Jason have some sort of rivalry going on. Not even they understand it honestly
Leo's super petty and refuses to tell Quill about anything important in his life, now. "You can't even tell me yourself that dad's dead but you expect me to tell you where I go to college? Get bent"
Nico genuinely believes that Leo and Peter think birds aren't real and are government spy drones. He's one wrong word away from signing them both up for a mental stability check
The demigods are some of Loki's favourite people purely because she gets shit-talk material from them
