They might be shocked at first. They probably didn't expect Percy, who is usually so strong and brave, to be dealing with depression.
The seven could also be very concerned and immediately start trying to figure out how to help. They would likely offer their support in different ways. Leo might crack jokes to try to cheer Percy up, while Piper could use her charm - speak to make Percy feel better about himself. Jason would probably be more practical and start thinking about how they can get Percy proper help, like finding a healer or someone who can understand what he's going through.
The others in the seven, like Jason, would probably feel a sense of guilt for not noticing earlier. They would come together as a group to support Percy. Jason might offer his friendship and strength to Percy, telling him he doesn't have to face it alone anymore. They would also likely start to investigate who was responsible for the abuse.
They might be shocked at first. They could feel a sense of guilt for not noticing earlier. Maybe they immediately try to comfort Percy and offer their support, like giving him a safe place to stay and assuring him that he's not alone anymore.
One possible cause could be the stress from all his past quests. He's been through so much, faced many dangerous situations, and lost some friends along the way.
Piper would use her charmspeak to try and soothe Percy's troubled mind. She'd also be very empathetic, listening to him without judgment. The rest of the Seven would also come together as a group. They'd create a safe space for Percy, where he could express his emotions freely, and they'd all work together to help him see that he is valued and loved.
They would likely be shocked and extremely worried. They might immediately try to stop Percy from doing it again and get him some help, like finding a healer or someone who can offer mental support.
The seven in this fanfiction are probably a set of characters who are central to the plot along with Percy. They could be his friends or allies in the world of demigods. Maybe they are characters like Annabeth, Jason, Piper, Leo, Hazel, Frank, and others who are on the same side as Percy in the fight against the forces of evil in their fictional world.
The reaction of the gods would be diverse. The muses might be intrigued and want to inspire Percy further. Dionysus, the god of wine and celebration, might see Percy's singing as a great addition to his wild parties. However, some of the more serious and war - like gods, such as Ares, might scoff at it, thinking it's a useless skill for a demigod. But overall, Percy's singing would definitely stir up a lot of different emotions and reactions among the gods in the fanfiction world.
The Olympians' reactions would be quite diverse. Some might be angry that one of their heroes, a son of a major god like Percy, has been reduced to homelessness. Zeus could be one of those who is initially angry, thinking it's a sign of disorder in the world he rules. However, as they start to understand the reasons behind Percy's homelessness, they would probably soften. Hermes, being the messenger god, might be the first to actually go and talk to Percy, trying to find out exactly what he needs. And Aphrodite, with her soft heart for love and beauty, might be among the first to offer him a place to stay, perhaps in one of her many beautiful abodes.
Well, one possible plot development could be that the Seven initially don't believe it. They might think Percy is joking or just going through a rough patch. But as they start to notice his withdrawn behavior, his lack of care for his own safety during quests, they realize the seriousness. Then they would probably try to surround him with love and support, and maybe even seek help from the gods, like asking Aphrodite to restore his love for life or Apollo to heal his mental state.
It could lead to a stronger bond among the seven. They would become more united in protecting each other.