Definitely Danny and Lagoona Blue. Lagoona is so laid - back and friendly, and Danny's ghostly nature would be a real novelty to her. They could have some really fun exchanges, like Danny showing her how he can phase through objects and Lagoona showing him her underwater skills.
Danny and Leonardo would be really interesting. Leo's leadership skills could clash or complement Danny's more impulsive heroics. Also, Donatello and Danny could have some great exchanges as Donnie is into technology and Danny has his high - tech Fenton gear. They could compare notes on their gadgets.
The interaction between Inuyasha and Danny would be really interesting. Inuyasha is a half - demon with a hot temper, while Danny is a teenage ghost - hero who tries to keep his cool. Their different personalities would lead to some funny and tense moments. For example, Inuyasha might be impatient with Danny's more methodical approach to problem - solving. Another interesting interaction could be between Danny and Kagome. Kagome could be curious about Danny's ghost powers and modern - day knowledge, while Danny might be intrigued by Kagome's spiritual powers and her role in Inuyasha's world.
The interaction between Alucard and Danny would be really interesting. Alucard is this ancient, powerful vampire with a dark sense of humor and a lot of mystery. Danny is a young, somewhat naive but heroic ghost. They would probably clash at first due to their different outlooks. Alucard might see Danny as a weakling, while Danny would be put off by Alucard's bloodthirsty nature. But as they face challenges together, they could learn from each other.
The interaction between Danny and Miss Martian could be fascinating. Miss Martian could try to read Danny's mind, but his half - ghost nature might make it difficult or give her some strange results. This could lead to some comical and also thought - provoking moments. Also, Danny and Aqualad could have a cool dynamic. Aqualad's leadership and connection to water could contrast with Danny's more chaotic and other - worldly powers.
The interaction between Danny Phantom and Superman could be fascinating. Superman is this all - powerful being, and Danny is a half - ghost with his own set of unique powers. Superman might initially see Danny as a bit of an oddity, but as they work together, he'd come to respect Danny's tenacity and the fact that he fights against some really spooky and powerful foes in his own world. And Danny would be in awe of Superman's raw power, yet also show him that there are different kinds of strength, like his ability to manipulate ectoplasm.
The interactions between Ford Pines and Danny's parents could be fascinating. Ford, with his vast knowledge of the strange and supernatural, might be intrigued by Danny's parents' attempts at ghost hunting, even if their methods are a bit more primitive compared to his own scientific investigations. Meanwhile, Danny's parents might be in awe of Ford's knowledge and the things he has discovered in Gravity Falls. This could lead to some comical moments as well as some interesting exchanges of ideas about the nature of the supernatural.
Definitely Danny and Dean. Dean is all about hunting monsters and his initial reaction to Danny, a half - ghost, would be very interesting. He might be skeptical at first but then see Danny's potential in fighting the supernatural threats that are a bit out of his usual realm.
Danny and Robin would have really cool interactions. They're both young heroes who are very intelligent. Robin could be intrigued by Danny's ghost powers and how they work, and Danny could be interested in Robin's detective skills and gadgetry. They could bounce ideas off each other when it comes to solving problems and fighting villains.
I think Danny and Batman would have really interesting interactions. Batman is always cautious and calculating, and Danny's half - ghost nature and his more carefree attitude would create a great contrast. Batman would probably try to study Danny and his powers, while Danny would be both impressed and a little intimidated by Batman's detective skills.
One possible plot could be Danny Phantom accidentally getting zapped into the Monster High dimension. He might initially be confused as he tries to figure out the different rules and types of monsters there. He could make friends with some of the Monster High characters like Frankie Stein, who would be curious about his ghostly powers.