If we got to see in depth, the repercussions of any of the demigods in pjo i think it'd be interesting to see Will's.
Will, who heals people, absorbing their pain, their wounds eating away at him, literally.
He can calm people down but at the same time, takes in their anxiety, causing him to go into panic attacks at random and develop anxiety himself.
His vein's turning dark as he's overworked by healing, his body growing weaker and weaker until his skin turns an ashy gray.
His body, littered with scars from the moments in battle where he cannot heal them and must bear the reminder of them forever.
He can heal wounds but not scars, he's terrified when he finds out at 12 years old, when he's healed an Aphrodite kid and they get upset with him because there's a deep scar left over on their skin, he's terrified at the reminder that, although he is half god, at his core he is human.