His family situation could also be a factor. His father is in Azkaban, and his mother is trying to hold the family together. He might feel the pressure of having to restore the family's name, but at the same time, he might be ashamed of what his family has become. This internal conflict could lead to depression.
One possible cause could be the aftermath of the war. He was on the losing side, and he might feel guilty for the things he did during the war, like helping the Death Eaters. He might be haunted by the memories of the violence and destruction he witnessed or was a part of.
One way to portray Draco's depression realistically could be through his internal monologue. For example, he might constantly have self - deprecating thoughts about his past actions and how they've led him to this state of isolation. He could also show signs of apathy towards things he used to care about, like his family's reputation or his magical studies.
One possible cause could be the loss of a loved one. In many stories, this kind of trauma can lead to depression. Percy might be struggling to come to terms with the death or departure of someone close to him.
It could be due to social isolation. Maybe she has been ostracized by her peers or community in the fanfiction world, which makes her feel alone and unworthy. This lack of connection can lead to deep - seated depression.
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.
It could be the weight of his responsibilities. Percy has always had a lot on his plate, saving the world multiple times. The constant pressure to be the hero might finally get to him, making him feel like he can't keep up. He might start to think that one day he'll fail and cause great harm.
One possible cause could be the dark magic that is constantly active within the mark. The Dark Mark is a symbol of Voldemort's power and control, and the dark magic it contains might be constantly causing pain as a reminder of Draco's loyalty to Voldemort.
One cause could be the pressure of living up to the pure - blood family standards. He might think that a certain body type or appearance is expected of him. Another possibility is the stress from his role in the wizarding world's conflicts. For example, the tasks he was given during the dark times at Hogwarts could have been so overwhelming that it affected his eating habits.
In some fanfictions, post - war, Hermione is involved in magical creature rights activism and Draco, who has a newfound sense of redemption, joins her cause. Their shared love for magical creatures, which they discover along the way, brings them closer. They start to communicate more, and their relationship evolves from animosity to mutual respect and eventually, perhaps, love.
In the fanfiction, Percy could start by reaching out to his friends. They might offer him support and understanding, which could be a great help in dealing with his depression.
It could also be related to his unfulfilled dreams. Naruto has big dreams for the village and for peace. But as he progresses, he might realize that achieving true peace is far more difficult than he thought. The gap between his ideals and the reality might be leading to his secret depression.