Another interesting pairing could be Danny and Houki. Houki's strong - willed nature and her sword - fighting skills could contrast well with Danny's more laid - back yet powerful ghost - fighting style. They could learn a lot from each other and have some great banter.
Danny and Ichika could be an interesting pairing. Danny's otherworldly powers combined with Ichika's mecha piloting skills could lead to some great action scenes and interesting character dynamics.
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.
A possible plot is that a villain in the Infinite Stratos world discovers Danny's powers and tries to use them for their own evil purposes. Danny has to team up with the main characters from Infinite Stratos, like Ichika, to stop the villain. Along the way, Danny teaches them about the supernatural and they teach him about mecha piloting.
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.
One popular pairing could be Danny and Robin. They are both young heroes with a lot of skills and a sense of justice. Their different backgrounds, Danny's ghost - related and Robin's more traditional hero training, could create an interesting dynamic in a relationship.
Clockwork could be a really interesting addition. He has so much knowledge about the past, present, and future of the Ghost Zone. He could either help Danny in his fight against Pariah Dark or be a bit of an enigma, not really taking sides but still influencing the events. His time - related powers could also add a whole new layer of complexity to the story.
One of the popular pairings is Danny Phantom and Raven from Teen Titans. They both have a connection to the supernatural and their personalities can complement each other. Another popular one could be Danny and Superboy. They are around the same age and their powers could create some interesting interactions.
Possible character pairings in 'Harry Potter x Danny Phantom mates fanfiction' include Draco Malfoy and Danny. It would be an interesting dynamic as Draco starts off as a rather snobbish character and Danny is a hero in his own world. Their interaction could lead to character development for Draco. Then there's Fred and George Weasley with Tucker. The twins' love for pranks and their inventiveness could team up well with Tucker's technological skills for some really wild and fun adventures. And lastly, Professor Snape and Maddie Fenton. Snape's complex personality and his knowledge of potions could interact with Maddie's scientific knowledge of the supernatural in some unexpected ways.
Kim Possible herself. She's a strong, independent character. In a fanfiction with Danny Phantom, she could be the one to teach Danny a thing or two about being a hero without superpowers (at least in the traditional sense). Her determination and resourcefulness would be a great contrast to Danny's more impulsive use of his powers at times. Plus, seeing her react to the supernatural elements of Danny's world would be fascinating.
The Fairly OddParents' Timmy Turner could be a fun character to include. He has his own set of magical fairy godparents. Imagine the chaos that could ensue when Danny's ghost powers and Timmy's fairy - granted wishes interact. They could accidentally create some really wild situations as they try to solve a problem together in a shared Nickelodeon universe.
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.