One idea could be an Acromantula befriending a Hogwarts student who is an outcast. The student discovers the Acromantula has a unique ability that could help in the fight against Voldemort. So they team up secretly.
Steve McGarrett is a great character to focus on. He's the leader of the team, with a strong sense of justice and a lot of backstory to explore, like his military past. Another good one is Danny Williams. His banter with Steve adds humor to the show, and his family - man side gives room for some emotional depth in a fanfic. Kono Kalakaua is also interesting. She's a strong female character with her own set of skills and a connection to Hawaiian culture that can be delved into.
Adventure is another theme. Since they have both been in movies with adventure elements, like 'The Lord of the Rings' series, fan fictions might create new adventure stories for their characters, perhaps sending them on a quest in a different world or time. For example, they could be on a journey to save a magical realm that is in danger. This allows fans to expand on the adventurous side of their characters.
One common theme is the clash of different power systems. The magic in Harry Potter and the supernatural powers in Underworld are very different, so seeing how they interact is a big theme. For example, how would a wizard's spell work against a vampire's strength? Another theme could be the exploration of different cultures within the two universes, like the wizarding culture and the vampire/werewolf culture.
It might imply delving into a complex or mysterious situation. Say in a corporate scandal. 'Watch the deep' could be about closely examining the core of the matter, and 'the inside story' is all the behind - the - scenes details, like who knew what, when they knew it, and how they tried to cover it up.
Another is within the family. Some gays have to endure the horror of being disowned by their families when they come out. Their own parents might cut off all communication, leaving them feeling completely alone and abandoned in the world, which is a truly heart - breaking situation.
There's a fanfic titled 'When Blaine Got Hurt on Stage'. It details the chaos that ensues when Blaine has an accident on stage during a concert. The author does a great job of depicting the emotions of the other characters, especially Kurt, who is deeply worried about Blaine. It also shows how the Glee club copes with this unexpected situation.
There are often fanfiction platforms where you can search for 'Troyella married' stories. Some might focus on their married life during holidays, like a romantic Christmas or a fun - filled summer vacation as a married couple. These stories can be really heart - warming and give fans a different perspective on their relationship.