Well, Risha Drayen is one of the most interesting. Her smuggler - like attitude and her relationships within the story, especially with the player character if they are in a romantic relationship. Then there's Gault Rennow. His shady past and his loyalty (or lack thereof sometimes) to the player are things that fan fiction writers love to explore. And Corso Riggs, with his farm - boy - turned - adventurer story, is also a very interesting character in swtor companion fan fiction.
In swtor companion fan fiction, Doc is quite an interesting character. His medical skills and his often - comical remarks can add a lot of flavor to a story. Kira Carsen is also great. Her journey from being a Jedi padawan to a more experienced warrior can be delved into deeply. And don't forget about Vector Hyllus. His hive - mind connection and his gentle nature make him stand out among the companions in fan fictions.
For me, it's Vette. Her story as a Twi'lek slave who rises above her circumstances is very inspiring. She has a lot of spunk and her relationship with the player character is really heartwarming. It shows how she grows from a somewhat naive slave to a strong and confident individual.
One popular theme is the relationship development between the player character and their companions. For example, how they grow from mere acquaintances to close friends or even lovers. Another theme could be the backstories of the companions. Writers often explore what made the companions who they are, like their past traumas or their hopes and dreams before joining the player. Also, adventure themes are common, where the companions and the player embark on new and exciting quests not in the original game.
Definitely Kara Zor - El herself. Writers can explore different facets of her personality, from her vulnerability as an alien trying to fit in on Earth to her great strength as a superhero. They can also play with her relationships, like with her sister Alex, which can add a lot of depth to the story.
One of the most interesting characters is often Nurgle himself. His grotesque and complex nature makes him a fascinating subject. He is both a bringer of disease and decay, yet also represents a sort of twisted form of life. Another interesting character can be the Plaguebearers. These are his minions, and in fan fiction, they can be depicted in different ways, sometimes with a bit of individuality among them. Then there are the Champions of Nurgle, humans who have given in to his power. Their internal struggle between their former selves and their new, corrupted selves can make for very engaging stories.
One of the best companion stories is probably that of HK - 47. His story is filled with dark humor and a unique perspective as a droid assassin. He has a lot of great lines and his loyalty to the player character is interesting to explore.
Shadow is often really interesting in fan fiction. His complex past and his brooding personality make for great storylines. Silver is also cool, especially when his time - traveling abilities are explored in different ways.
Chunk is always a great character to include. His funny and sometimes clumsy nature can add a lot of humor to the story. For example, he could accidentally trigger a booby - trap while the Goonies are exploring a new cave, but then also be the one to find a way out of it in a really unexpected way.
Definitely Xena and Gabrielle are among the most interesting. But in alt fan fictions, some writers introduce a mysterious figure from Xena's past, perhaps an old enemy or a long - lost friend. This character can add a whole new layer of mystery and drama. Also, there are often characters that are hybrids of different species in the Xena universe. These unique creations bring in elements of the supernatural and the unknown, making them very engaging in the fan - written stories.
I think it's Hancock. He's a ghoul mayor with a wild past. He used to be a chem addict and has done some dark things. But he's now trying to make things right in Goodneighbor. His story of redemption and his unique view on life in the wasteland are really captivating.
Aloth is another character with a fascinating companion story. His struggle with his own identity, being a wizard with a dual personality, is a central part of his narrative. His journey to come to terms with himself and his place in the world makes for a great story as you play through the game with him.