The themes often involve loyalty. Slytherins in these fanfics show loyalty to Harry in a way that goes against the stereotype of their house. Some fanfics also have the theme of family. Maybe a Slytherin character sees Harry as a surrogate family member and will do anything to protect him. There are also themes related to justice, where Slytherins protect Harry because they know he's the key to a just future for the wizarding world.
One reason could be that they see Harry as a powerful ally. They know his skills and abilities, and they want to be on his side.
Well, in some fanfics, Slytherins might be protective of Harry in an abuse scenario because they see the injustice. They could be written as having a sense of fairness that overrides the typical house rivalries. Maybe they've come to understand Harry's situation better than others and feel compelled to protect him.
There are quite a few. Some fanfics focus on individual Slytherin students who form an unlikely bond with Harry. They might protect him from the dark forces that are after him, seeing him as more than just the 'Chosen One' but as a friend in need. These fanfics often explore the idea that not all Slytherins are bad and can be quite heroic when it comes to protecting someone they believe in.
One main theme is loyalty within the Slytherin house. Slytherins are often depicted as loyal to their own kind. Another theme is ambition. They strive for power and success in different ways. Also, the idea of redemption can be a theme, as some fanfics show Slytherins trying to overcome the negative stereotypes associated with their house.
Another theme is the idea of hidden alliances. In many of these fanfics, the Slytherins form a secret group to protect Hermione. This adds an element of mystery and intrigue as they work behind the scenes to keep her safe from threats, both inside and outside Hogwarts.
There's also 'The Slytherin Guard for Hermione'. This fanfic shows how some Slytherins, who have grown tired of the house's bad reputation, choose Hermione as the symbol of their change. They protect her from dark wizards who target her for her Muggle - born status. It's an interesting take on how Slytherins can be allies.
In abuse - related fanfics, Slytherins being protective of Harry can be a way to explore different character dynamics. It breaks the mold of the typical Hogwarts houses' relationships. Slytherins might be written as having a hidden soft side that emerges when they see Harry being abused. It could also be that the author wants to create a more inclusive and diverse story where traditional enemies can become allies.
Another common theme is the exploration of morality. Thanos has his own view on what is right and wrong regarding population control in the universe. Harry, coming from a world with its own set of moral codes in the wizarding community, often challenges Thanos' ideas. This creates a lot of interesting debates within the fanfics.
A sense of justice is often a theme. The champions see the unfair treatment of Harry, especially from the likes of the Death Eaters and some in the wizarding world who are against him. So, they take it upon themselves to protect him as a matter of justice. This can lead to some great plotlines where they fight against the forces of evil to safeguard Harry.
Another theme is redemption. Draco's protective actions can be seen as a part of his journey to redeem himself, especially considering his past actions in the original series. For example, in many fanfics, he tries to make up for his past mistakes by protecting Harry from various threats.