Cobra Kai is purely fictional. It takes the concepts and characters from the Karate Kid and builds on them in an imaginative way, rather than being rooted in real-life happenings.
One of the main characters is Daniel LaRusso. His relationships, both friendly and romantic, play a significant part in the story. Then there's Johnny Lawrence. His personal growth also involves his love interests. Their interactions with other characters, like their students, also shape the love story aspect of Cobra Kai.
Well, it's special due to the complex characters. In Cobra Kai, the characters have their own flaws and insecurities. When it comes to love, these aspects add depth. For example, their past traumas from the karate battles can either bring them closer or create more obstacles in their love story. It's not a typical love story but one intertwined with the spirit of Cobra Kai.
One interesting crossover could be Naruto characters learning the fighting styles of Cobra Kai. For example, Naruto himself might be intrigued by the aggressive and unorthodox methods of Cobra Kai. He could adapt some of their moves into his own ninja combat, creating a unique blend of shinobi and karate techniques. Another aspect could be the different philosophies clashing. The Cobra Kai 'strike first' mentality might be at odds with the ninja code of honor in Naruto, leading to some intense character development moments as characters from both universes interact and try to understand each other.