One possible theme could be self - discovery. If Draco is portrayed as a 'fat slob', he might go through a journey of realizing his own state and trying to change. Another theme could be social ostracism. People in the story might treat him differently because of his appearance.
I'm not sure specifically as there could be various interpretations. It might be a fan - made story where the character Draco is depicted in an unflattering way as a 'fat slob'. However, without reading the actual fanfiction, it's hard to say for certain.
I have no idea if it's popular. It could be popular within a small niche of fans who enjoy this kind of unorthodox take on the character, or it might not be well - known at all. There are so many fanfictions out there that it's hard to gauge the popularity of just one without proper research.
I haven't come across a particular 'fat slob draco fanfiction' myself. However, you can look for it in fanfiction communities. Maybe start by using relevant tags when you search. For example, if it's related to a specific series like Harry Potter (assuming Draco is from that), use tags related to both Draco and the series to narrow down your search.
Maybe it could be about how Draco's slobbish habits annoy his friends or family in the fanfiction world. For example, he might leave his things all over the place in the Slytherin common room, causing chaos and getting into little squabbles with his housemates.
One common theme is self - acceptance. Draco has to come to terms with his new body shape, which is often a journey of learning to love himself again. For example, in many stories, he initially struggles with how others perceive him but then grows stronger.
His father, Lucius Malfoy, might also be a main character. Lucius, who is always so concerned about appearances and family reputation, would be horrified by Draco's slobbishness. There could be a lot of conflict between them as Lucius tries to force Draco to be presentable again. And then there's Hermione Granger. Since she's always so neat and organized, she might be appalled by Draco's slobbish ways and get involved in some sort of rivalry or strange friendship with him because of it.
Well, in 'halfbreed draco leash fanfiction', there could be themes related to acceptance. The halfbreed might struggle to be accepted in a world where Draco (who might be from a more 'normal' or dominant group) exists. The leash could also represent a connection that is both physical and emotional. It could be a source of comfort or a source of conflict. Another theme might be transformation. The halfbreed could be in a process of changing, and Draco's presence (along with the leash as a symbol) could either aid or hinder that transformation. There could also be themes of mystery, especially if the origin of the halfbreed or the purpose of the leash is not immediately clear.
Family reconciliation is another theme. The Malfoy family has its own internal struggles. A hug between Lucius and Draco could symbolize mending their broken relationship. It could be set in a post - war scenario where they are trying to pick up the pieces of their lives and come to terms with each other again.
Since I'm not familiar with the exact 'cage draco plug' fanfiction, it's hard to say for sure. But common themes in fanfiction could include adventure, friendship, or mystery. Maybe in this case, if 'cage' is a physical object, it could be about confinement and escape. And if 'draco' is a character, perhaps his development or relationship with other characters in the context of this 'cage' situation.
One possible theme could be the exploration of Draco's vulnerability. When he's 'naked' in a metaphorical sense, perhaps it shows his true self stripped of the Malfoy facade. Another theme might be disillusionment with the wizarding world. Maybe the fanfiction delves into how Draco, who was once so sure of the pure - blood ideology, now sees the flaws in it.