Yasmin Khan would be a great character to include. She was one of the Doctor's companions and her relationship with the Thirteenth Doctor was full of friendship and adventure. Her skills and her growth throughout her time with the Doctor can add depth to the fanfic.
Ryan Sinclair is another good character. His own personal journey and how he interacted with the Thirteenth Doctor on their travels can bring a lot to a fanfic. His perspective as a young man in modern times facing the wonders and dangers of the universe can be explored further in a fan - created story.
The Master can also be a great addition. The complex relationship between the Doctor and the Master always makes for an interesting dynamic. In a Thirteenth Doctor fanfic, their encounters could be filled with mind games, power struggles and unexpected alliances.
Well, in a Thirteenth Doctor OC fanfic, it's important to capture the essence of the Thirteenth Doctor's character. She's energetic, curious, and always ready for an adventure. Your OC could be someone who gets caught up in one of her adventures by accident. For example, they could be a scientist working on a project that the Doctor is also interested in. This could lead to a great story of discovery and teamwork.
Sonic himself is a must - include. His speed and adventurous spirit drive the story forward. Tails is also great as he can provide technical support and is Sonic's loyal friend. And Dr. Eggman, as the main antagonist, always adds conflict and excitement to the story.
Vegeta is a great choice. His rivalry with Goku adds a lot of drama and action to a fanfic. Also, Piccolo, as he has a long history with Goku and has been both an enemy and a friend. Another good character could be Gohan, Goku's son, as it can explore their father - son relationship further in the fanfic.
Another good character to include is Lex Luthor. He could be the mastermind behind a plot to drive a wedge between Batman and Wonder Woman. His devious mind and resources would make him a formidable antagonist, and his interactions with the two heroes would add a lot of drama to the story.
Optimus Prime is a great choice. His leadership and wisdom can add depth to the story, and his relationship with Bumblebee can be explored further. Also, Sam Witwicky, as he has a strong bond with Bumblebee in the movies. Their friendship can be a central part of the fanfic.
Definitely Naruto himself, as he is the main character of the original series. Sasuke is also a great choice as his complex relationship with Naruto can add a lot of drama. Kakashi is another good character to include. His wisdom and unique abilities can be very useful in the story. And Sakura, her growth as a ninja can be explored further in a fanfic.
Well, obviously Armikasa themselves are the main focus. But you could also include their friends. For example, their comrades who are with them in training or on missions. These characters can add more depth to the story by providing different perspectives and interactions.
Nami would be a great character to include as she has a deep - rooted history with Arlong. Their interactions can add a lot of drama and emotion to the story. Luffy is also a good choice as he is the main protagonist and his values of freedom and justice would contrast sharply with Arlong's tyranny.
Obviously, Willy Wonka himself is a must - include. He's the heart and soul of the factory. Charlie Bucket is also great as he represents the pure - hearted visitor. The Oompa - Loompas add a lot of fun and mystery with their strange songs and unique appearance. Veruca Salt can bring in some drama as she was the spoiled brat in the original story.
In a Thirteenth Doctor OC fanfic, pacing is crucial. You don't want to rush the relationship between your OC and the Doctor. Start with small encounters, like the OC seeing the TARDIS for the first time and being curious. Then, as the story progresses, build up to more significant events, such as them traveling together through time and space. Also, pay attention to the dialogue. It should feel natural and reflect the personalities of both characters.