Lizzie could be a popular cheerleader - type character. She's always trying to get Ciel's attention and is really good at sports. But she also has a bit of a temper when it comes to other girls getting too close to Ciel. And then there could be a new character, a shy transfer student who gets caught up in the drama between Ciel and the other students, and she has her own special abilities that she's not aware of at first.
I think Tiana from 'The Princess and the Frog' would be a great character. She could be the hard - working student who is always trying to save up for college by working part - time jobs at the school cafeteria or library. She might also be part of a cooking club and compete in school - wide cooking contests. Another interesting character would be Hercules. He could be the star athlete in high school, but also a bit of a dork when it comes to academics. He would constantly be trying to balance his sports achievements with his need to study and fit in with the smart kids. And Maleficent could be the mysterious, feared teacher who has her own hidden agenda for the school.
Ciel and Sebastian are usually the most popular. Ciel with his cool and calculating demeanor, even in a high school setting, is quite appealing. And Sebastian, with his charm, loyalty to Ciel, and his many skills, always draws a lot of attention. People love to see how they interact with the high school environment and other characters.
Definitely Pikachu. Pikachu is Ash's loyal partner and can add a lot of cute and funny moments in the high school setting. Another interesting character could be Misty. She could be the tough girl who has her own ideas about Pokémon training and often clashes with Ash in a friendly way. Gary Oak is also great. His rivalry with Ash can be taken to a new level in high school, competing not just in Pokémon battles but also in academics or popularity.
Definitely Annabeth. In a high school setting, she could be the super - smart girl who helps Fem Percy with her studies while also being involved in the demigod stuff. Her strategic mind would be great for solving high school mysteries too.
Sebastian is definitely one of the most interesting. His demon nature combined with his loyalty to Ciel makes him a complex character. Then there's Ciel himself. His determination for revenge and his ability to command Sebastian despite his young age are quite fascinating.
Sebastian would be the most interesting. His demonic nature and his loyalty to Ciel would bring a whole new dynamic to the Avengers. He could easily outmaneuver most of the villains with his wits and powers.
Ciel is definitely one of the most popular. His complex personality and his tragic backstory make him a great focus for fanfiction. Writers can explore his inner thoughts and feelings more deeply. Sebastian is also very popular. His demonic nature and his loyalty (in a rather twisted way) to Ciel are fascinating aspects to write about. Grell is another popular character. His flamboyant and somewhat deranged personality offers a lot of room for creativity in fanfiction.
Sebastian is definitely one of the most interesting. His demonic nature and his perfect butler facade make him a complex character. Ciel, too, with his determination for revenge and his dual nature of a young boy and a shrewd master, is very engaging.
In a 'Black Butler' crossover fanfiction, characters like Alucard from 'Hellsing' would be great. He's a powerful vampire, and his presence would create an interesting dynamic with Sebastian. Another good character could be L from 'Death Note'. His brilliant mind and unique personality would be an interesting contrast to Ciel's cunning. Also, Edward Elric from 'Fullmetal Alchemist' could bring in his knowledge of alchemy and his strong sense of justice, which would interact in an engaging way with the morally ambiguous world of 'Black Butler'.
One more interesting pairing could be Undertaker and America. Undertaker's mysterious and somewhat macabre nature against America's bold and brash attitude. America might be curious about Undertaker's strange hobbies and Undertaker could be intrigued by America's naivete and strong sense of justice. It would be fascinating to see how they interact, whether they become friends or end up at odds with each other. Also, Mey - Rin and Japan could have an interesting dynamic. Mey - Rin's clumsy but kind - hearted nature and Japan's reserved and traditional ways could lead to a unique relationship where they learn from each other.