Sonic and Twilight Sparkle would be great. Twilight is known for her intelligence and magic, and Sonic for his speed. They could combine their skills to solve problems. For example, Twilight could use her spells to open portals while Sonic races through them to reach different locations quickly.
Pinkie Pie and Sonic could also be interesting. Pinkie Pie's random and fun - loving nature could contrast with Sonic's more serious and goal - oriented attitude. Maybe Pinkie Pie could cheer Sonic up when he's feeling down about not being able to stop an enemy, and in return, Sonic could teach Pinkie Pie some cool moves. This could lead to a unique and humorous fanfiction.
In sonic my little pony crossover fanfiction, Knuckles can also be a popular character. His strength and loyalty can be an interesting contrast to the ponies' characteristics. And Pinkie Pie from My Little Pony is often included because of her fun - loving and unpredictable personality. Her energy can match Sonic's high - energy world, and their interactions can be both humorous and engaging.
In Danny Phantom, Danny himself is often a popular choice. His cool powers and heroic nature make him a great addition to any crossover. In My Little Pony, Twilight Sparkle is a common character in fanfiction. She's intelligent and powerful, so she could interact well with Danny.
Sunset Shimmer is extremely popular. She has a complex backstory, having once been a villain but then redeemed herself. Her journey of self - discovery and growth makes for great fanfiction material. Then there's Twilight Sparkle, who brings her book - smart and sometimes naive personality to Canterlot High. Also, Rainbow Dash with her competitive and loyal nature is often a favorite. She can be involved in sports - related plots or stories about loyalty among friends.
Sonic himself is usually very popular. His cool attitude and super - speed make him stand out in any crossover. He brings a sense of action and adventure.
One unique element is the combination of different power sets. Sonic's super speed and the ponies' magic create interesting scenarios. For example, in some stories, Sonic's speed is used to help the ponies in their magical tasks or to outrun magical threats.
Rainbow Dash is a great character to pair with Gilda in fanfiction. Their pre - existing relationship gives a lot of room for development. Also, Pinkie Pie can be an interesting pairing as her bubbly nature can contrast with Gilda's more rough - around - the - edges personality.
In many fanfictions, there's a Bat Pony leader character. This character is usually strong and wise, guiding the Bat Pony community. For example, a character like Shadowwing. Also, there are Bat Pony characters who are hybrids, part Bat Pony and part other magical creature. They tend to be popular as they have unique abilities and backstories. They can be both a source of intrigue and a bridge between the Bat Pony world and the rest of Equestria.
One idea could be a story where Sonic accidentally runs into the My Little Pony world. He could team up with Twilight Sparkle to stop an evil force that's threatening both their worlds. Maybe a chaos - causing villain has found a way to cross between the two realms.
Adventure is also a big theme. Sonic is known for his adventures, and when combined with the magical and diverse world of My Little Pony, there are all sorts of adventures to be had. For example, they might go on a quest to save a magical artifact or a pony in distress.
One common theme is friendship. Just like in their original shows, fanfictions often explore how characters from both universes form bonds and support each other. For example, Sonic might help a pony in trouble, and in return, the pony could offer Sonic some of their magical assistance.