Definitely Twilight Sparkle. Her studious nature and powerful magic would create an interesting dynamic with Discord's chaos. She'd be constantly trying to analyze and fix whatever Discord has messed up. Pinkie Pie is also great. Her zany personality could either match Discord's chaos or be a source of irritation for him. Rainbow Dash would be cool too. Her bravado and flying skills could be put to the test when Discord throws up some wild obstacles in her path.
I think Fluttershy is a really interesting character to include. Given her gentle and shy nature, she could have a very different reaction to Discord's chaos compared to the others. She might be the one to try and calm him down in a really unique way. Discord himself is of course a must - have. His unpredictable nature is what drives the whole crossover concept. And Rarity could also be included. Her love for beauty and order would be constantly challenged by Discord's antics, leading to some really funny and dramatic scenes.
Obviously Discord himself is a very popular character to feature. His chaotic nature and powerful magic make for interesting storylines. Pinkie Pie is also a common choice as her zany personality can either clash or complement Discord's chaos in really fun ways.
Obviously, the daughter of Discord is a main character. She would be at the center of the story, with her own personality, goals, and growth throughout the fanfic.
One idea could be that Discord causes chaos in Equestria that the MLP characters have to solve in a really wacky way. For example, he might turn all the clouds into cotton candy and the ponies have to figure out how to make it rain again without making a huge mess. Another plot could involve Discord getting his powers mixed up with a unicorn's magic and they have to work together to undo it. Maybe he accidentally gives Twilight Sparkle the power to turn things into random objects every time she tries to use her normal spells.
Pearl would be an interesting character to include. Her grace and combat skills, combined with her complex backstory, could add depth to any crossover. In a crossover with a historical - themed show, Pearl's knowledge of different eras could create interesting storylines. Another interesting character is Garnet. Her fusion status and stoic nature can lead to unique interactions, especially in a crossover with a show that also has characters with dual identities or special powers.
Agent O'Connor from 'kc undercover' is an important character. In a crossover, perhaps a character like James Bond could be included. Bond's suave and sophisticated spy style would be an interesting contrast to Agent O'Connor's more down - to - earth approach. And if it's a crossover with a post - apocalyptic show, a tough survivor character could add a new dimension to the story, as they all have to work together to face new threats.
Definitely Pikachu and Twilight Sparkle. Pikachu is one of the most iconic Pokemon, known for its cute appearance and electric powers. Twilight Sparkle is a central character in MLP, being very intelligent and powerful in magic. Their personalities are quite different, which makes for an interesting dynamic when they meet in a crossover fanfic. They could learn from each other, with Pikachu showing Twilight about the world of Pokemon battles, and Twilight introducing Pikachu to the magic of Equestria.
Well, obviously Discord is one of the main characters. He brings his chaotic and powerful nature to the story. Then there's the 'bride' character, who could be an original creation or an existing character from the MLP universe given a new role. For example, it could be a mare who catches Discord's eye in a unique way.
Seto Kaiba and Gary Oak would make for a fascinating pair in a crossover fanfic. Kaiba's arrogance and Gary's self - assuredness could lead to some intense rivalries. They might compete to see who can be the best in both the Yugioh and Pokemon worlds. Another interesting character would be Serena. Her kind - hearted nature could be a contrast to some of the more intense Yugioh characters. She could form bonds with the Duel Monsters in a different way than the other characters, perhaps using her compassion to calm down some of the more aggressive ones.
Definitely Naruto himself. His energetic and determined personality would be a great contrast to the often more somber characters in Skyrim. Also, characters like Sasuke could be interesting. His brooding nature and powerful Sharingan abilities would make for some great interactions in Skyrim's dangerous world. And from Skyrim, the Dragonborn would be a must - include. The clash or cooperation between the Dragonborn's Thu'um and Naruto's jutsu would be really exciting to write about.
The Master Chief is an obvious choice. His stoic and powerful presence would be really interesting in the Skyrim setting. He could be like an otherworldly hero, and his Spartan abilities would make him a force to be reckoned with against Skyrim's foes.