In a 'Black Widow Miraculous Ladybug' fanfic, aside from Ladybug and Black Widow, there could be villains as main characters too. Maybe Hawkmoth, the main antagonist in Miraculous Ladybug, could be a central figure. He would be interested in Black Widow's abilities and might try to either recruit her or find a way to take away her powers if she has any in the fanfic's universe. And Tikki, Ladybug's kwami, could also play a major role as she is the source of Ladybug's powers and could have some interesting interactions with Black Widow.
In addition to the Avengers, there could be original characters created by the fanfic writers. These characters could be doctors or nurses taking care of Black Widow in a secret medical facility. Or they could be other agents who have some connection to her past. Sometimes, even villains from the Marvel universe might interact with her while she's in a vulnerable state, either to gloat or to try and make a deal with her.
It could involve a crossover of the two universes. Black Widow might find herself in Paris and get caught up in the fight against Hawk Moth. She could use her martial arts skills to take on the akumatized villains.
There might be a fanfic where Black Widow is a mentor figure to Ladybug in a 'Black Widow Miraculous Ladybug' story. She could teach Ladybug some new fighting techniques and ways to outwit her enemies. This would be really cool as it combines the spy - like skills of Black Widow with the magic - based powers in Miraculous Ladybug.
Obviously, Ladybug (Marinette) and Chat Noir (Adrien) would be the main characters. Their dynamic relationship as superheroes and the potential for a summer love story between them is really exciting.
Obviously Ladybug and Chat Noir would be the main characters. They could be joined by Alya, who might be a breakdance enthusiast and helps them understand the breakdancing world better. Maybe she could be their breakdance coach in a way.
Obviously, Marinette and Adrien would be key characters. Marinette could be the host of the sleepover, and Adrien might show up unexpectedly, either as himself or as Chat Noir. Their interactions would be the focus, whether it's some cute and awkward moments between them.
Obviously, Ladybug and Cat Noir are the main characters. Their immortality would likely be a central focus of the story. They would be the ones experiencing the changes and challenges that come with living forever.
The main characters are Ladybug and Chat Noir. Ladybug is Marinette Dupain - Cheng in her civilian form. She is brave, intelligent and creative, always coming up with plans to defeat the villains. Chat Noir is Adrien Agreste as a civilian. He is charming and flirty, and his power complements Ladybug's well in their battles against evil.
Ladybug and Chat Noir are still the main characters. They are the ones who have to face the challenges related to the robots. There might also be new characters like the creators of the robots or people who are affected by the robotic events.
Well, Ladybug is always a central character. She's the one with the Ladybug Miraculous and the responsibility to save Paris. Chat Noir is right there beside her, with his charm and combat skills. Traibih, in these fanfictions, is often a character that adds more depth to the story. She might be a new hero or someone with a special connection to the Miraculous world. There could also be other characters like Alya, who is Ladybug's friend in the original series and might play important roles in the fanfiction as well.