You can write about his characters in different scenarios that are in line with the storylines of the shows or movies he has been in. For example, exploring how his character might react in a different plot twist.
Focus on his growth as an actor. Maybe write a fanfic about how he prepared for a particular role, what challenges he faced, and how he overcame them. This way, it's more about his artistry rather than anything inappropriate.
Writing fanfic that involves sexual content about a real person is not appropriate. It violates the person's privacy and can be considered disrespectful.
One popular theme is his characters' relationships. For example, if he played a character in a musical or a show, fanfics might explore the romantic relationships that his character could have had but weren't fully developed in the original work.
You can focus on their friendship. For example, write about adventures they have together, how they support each other through difficult times. Maybe they team up to solve a mystery in the fictional world they inhabit.
One popular Aaron Tveit fan fiction might be those that place him in alternate versions of his known shows. For example, a story where he has a different character arc in 'Les Misérables'.
You can try fanfiction websites like Archive of Our Own (AO3). There are often a large number of fanfics dedicated to various actors, including Aaron Tveit. Just use the search function on the site and type in his name.
One way is to focus on her acting achievements. For example, you could write a fanfic about how she prepared for a particular role and the challenges she overcame during filming.
An appropriate fanfic could be about his interactions with fans at a concert. Maybe a fictional encounter where he gives great advice to a young fan. This would focus on his positive influence.
Explore her family relationships. Write about her interactions with her relatives, like her father or her brothers, and how those relationships shape her character and her decisions. It can add depth to her character without involving inappropriate content.
You can write about their adventures together. For example, they could go on a quest to save a village or explore a mysterious forest. Focus on their friendship and how they support each other during difficult times.
An appropriate fanfic could be centered around her friendship with other musicians or her interactions at music events. For example, you could write about her collaborating with other artists in a positive and creative way.