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.
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.
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.
I think Danny and Batman would be a really interesting pairing. Batman is all about strategy and detective work, and Danny with his ghost powers could provide a different kind of assistance. Danny might be able to use his intangibility to access places Batman couldn't, and Batman could help Danny with his combat skills and planning.
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.
Spider - Man and Batman would also have a fascinating interaction. Both are known for their intelligence and use of gadgets. They could compare notes on their detective skills and strategize together against their enemies. Maybe Batman would be impressed by Spider - Man's agility and quick thinking in combat.
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 Superman and Supergirl would be really interesting. They share the same Kryptonian heritage but have had different experiences on Earth. Superman could act as a mentor to Supergirl, or they could have a friendly competition to see who is stronger in different situations.
Rorschach and Batman would also be a great pair. They are both dark, brooding characters who are very dedicated to their own versions of justice. They might start off clashing due to their different methods, but eventually find common ground in their pursuit of truth.
Goku and Superman would be extremely interesting. They are both powerful heroes with a strong sense of justice. Superman might be intrigued by Goku's Saiyan heritage and his ability to constantly increase his power. Goku, on the other hand, would be excited to meet someone as strong as Superman. Their initial sparring match could be epic, with both testing their limits. Another interesting interaction could be between Goku and Batman. Batman would be very cautious around Goku, trying to analyze his weaknesses. Goku would probably be a bit confused by Batman's lack of obvious superpowers but would respect his intelligence and combat skills.