You could include characters like Hermione from 'Harry Potter'. She would be great in a girls night out scenario where they go to a wizarding library for a special event or something. Another could be Katniss from 'The Hunger Games'. Imagine her on a girls night out in the Capitol, exploring the strange and decadent nightlife there.
Buffy from 'Buffy the Vampire Slayer' would be a really cool character to include. Her friends could all go on a girls night out, which might end up turning into a vampire - slaying adventure in an unexpected way. Also, Elle Woods from 'Legally Blonde' could be in a girls night out where they go to a high - class club or a legal - themed party, and Elle shows off her smarts and style.
Joey Graceffa is a very popular character to include. His presence can add a lot of drama and leadership to the story. Also, Colleen Ballinger would be a great addition as she can bring her comedic yet strong - willed personality. Another one could be Shane Dawson, who has a very unique and often dark sense of humor that would fit well in the spooky 'escape the night' world.
Professor Utonium is a popular character to include. He is the creator of the Powerpuff Girls and his relationship with them can be explored in different ways in fanfiction. Maybe he creates a new experiment that has unexpected consequences for the girls. Another popular character could be the Rowdyruff Boys as they can create interesting rivalries and storylines with the Powerpuff Girls.
In many such novels, there might be a main character who is at a crossroads in her life. For example, she could be facing a big decision like changing jobs or moving to a new city. Her friends in the girls' night out group play different roles in her journey. There might also be an older, wiser character who gives advice to the others, and a younger, more impulsive character who often gets into minor scrapes during the night.
C.C. could definitely be one of the main characters. She has a mysterious past and a lot of knowledge about the Geass. Her presence would add an air of mystery and intrigue to the girls' night out. Kallen could also be there. She's a strong - willed character, and her stories from the battlefield would make for interesting conversation during the night. And of course, Milly. She's always been the fun - loving and carefree one in the Geass series, and she would bring a lot of humor to the group.
Fluttershy could be an interesting character to include. Her gentle nature could be a contrast to Shadow's more brooding personality. It could lead to situations where Shadow learns to be more empathetic or Fluttershy becomes more assertive in his presence. Sunset Shimmer is also a key character as she has a complex backstory and her knowledge of both worlds can play a significant role in a fanfiction involving Shadow.
You could include a passionate and talented lead dancer like Mia from 'Step Up' - type character. Also, a strict but fair dance instructor who has high expectations for their students. And don't forget about the rival dancer who is always trying to outshine the main character.
A court jester can add some humor. He can be the one who sees through the courtly pretenses and gives the emperor some down - to - earth advice in a comical way.
If you're doing a crossover with 'Marvel', characters like Spider - Man would be great. His agility and quick thinking could help in the 'escape the night' scenarios. Also, Iron Man with his technology could provide some useful gadgets. In a crossover with 'DC', Batman would be a good addition. His detective skills and combat abilities would be very useful. Another option could be Wonder Woman, with her strength and courage.
Definitely Naruto and Toriko themselves. They are the main characters of their respective series, so having them interact is a must in most fanfictions.
Another popular Pokemon to include could be Charizard. It's big, strong, and has a cool design. From Avatar, Katara could be included. Her waterbending skills and strong personality would make for great interactions with Pokemon. Maybe she could use her waterbending to heal injured Pokemon.