I'm not sure of specific titles off the top of my head, but you can try searching on fanfiction - specific websites. Look for ones with high ratings and lots of reviews. Usually, those are the better - quality ones.
Some good fanfiction might be the ones where the writers really understand both universes well. They would blend the characters' personalities and the unique aspects of each world in a seamless way. For example, if a writer knows how Danny's relationships with his friends in his world work and can translate that into how he interacts with the ponies in the pony world, it would make for an interesting read. You might also look for ones that have an original plot rather than just rehashing old storylines from either universe.
Another way to find good fanfiction is to ask in relevant online communities. There are forums and groups dedicated to Danny Phantom and My Little Pony. People in those communities are often very passionate about the shows and might be able to recommend some great fanfiction that they've read. They can also give you warnings about any fanfiction that might not be so good, like ones with inconsistent characterizations or poor grammar.
One great 'My Little Pony and Danny Phantom fanfiction' is 'Phantom in Equestria'. It has an interesting plot where Danny somehow gets transported to the world of My Little Pony. Another one could be 'The Ghostly Pony' which combines the unique powers of Danny with the magical world of ponies in a really creative way.
One idea could be a crossover where Danny Phantom's powers are needed in Equestria to fight off some sort of dark magic. Maybe the ponies mistake his ghostly form for a new type of magical creature at first.
One common theme is the exploration of different powers. Danny has his ghost powers and the ponies have their magic, so fanfictions often explore how these powers interact. Another theme is friendship. Just like in their original shows, the stories usually focus on how characters from different worlds can become friends and support each other.
A more complex concept could be a fusion of the two universes where the elements of the My Little Pony world, such as friendship and magic, interact with the ghostly elements of Danny Phantom's world. For example, the magic in the pony world could be used to enhance Danny's powers or to help him control his ghost side better. And Danny could introduce the ponies to new ways of thinking about things that are different from their normal, more positive and friendly world view.
One idea could be that Danny Phantom accidentally gets sucked into the My Little Pony world. He could use his ghost powers to help the ponies solve a mystery that's been haunting their land, like strange disappearances that are actually caused by a mischievous ghost pony. Danny would have to adapt to the colorful and friendly world of ponies while also trying to find a way back home.
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.
Danny and Twilight Sparkle would make an interesting pair. Danny with his ghost - fighting skills and Twilight with her powerful magic. They could exchange knowledge about their different worlds and powers. Danny could learn about magic from Twilight, and Twilight could be fascinated by Danny's ghost powers.
I'm not sure of specific ones directly from 'danny phantom tue fanfiction', but some general great Danny Phantom fanfictions often focus on Danny's growth as a hero. They might show him becoming more confident in his powers. Some also explore his relationships with other characters like Jazz, his sister. You can search on popular fanfiction websites and look for ones with high ratings and good reviews.
There's also 'Dark Danny's Reign'. This fanfiction delves deep into what would happen if Dark Danny took over completely. It has some intense action scenes and really shows the power of Dark Danny. It's a great read for those who like exploring the darker aspects of the Danny Phantom universe.
Well, 'Shadowed Love' is a really good Danny Phantom Sam and Danny fanfiction. In this story, the author does an amazing job of building up the tension between Sam and Danny. It's filled with sweet moments and also some action - packed scenes. Then there's 'Sam and Danny: Unspoken Promises'. This one explores their friendship and how it could potentially turn into something more. And 'The Phantom's Heartbeat' is a fan favorite as it shows a more vulnerable side of Danny when it comes to his relationship with Sam.