How about a crossover with the Teenage Mutant Ninja Turtles? Max could end up in New York City's sewers and meet the turtles. They would have to fight against the Foot Clan who has somehow gotten their hands on some advanced alien technology. Max's knowledge of high - tech could help the turtles upgrade their weapons while they teach him some of their ninja skills.
A crossover with the Transformers could be really cool. Max Steel could find himself in the middle of a battle between the Autobots and Decepticons. His alien - tech powers might be misinterpreted at first, but then they could work together to stop a greater threat, like an evil techno - organism that wants to take over both their worlds.
One plot idea could be that after their kiss, Max and Sydney have to deal with the consequences within their team. Maybe some of their teammates are jealous or think it will affect their performance in fighting villains.
One possible plot could be that Max Steel's nanotech powers somehow get connected to the chakra system in the Naruto universe. Maybe a villain is using both the technology from Max Steel's world and ninja jutsu from Naruto's world to create chaos. Naruto and Max Steel team up, with Naruto teaching Max about chakra control and Max showing Naruto the advanced technology. They then combine their powers to defeat the villain, for example, Naruto using his Rasengan enhanced with Max's nanotech energy.
You could have a Sam and Max crossover fanfiction where they enter a steampunk world. There, they'd encounter steam - powered machines, airships, and clockwork creatures. They might get involved in a mystery regarding a stolen blueprint for a powerful new engine. Also, they could cross over with a world of talking animals. Sam and Max could interact with all these different animals, and together they'd solve a mystery that affects both the animal world and their own.
One popular plot idea could be the OC having a special power that Max Steel discovers and they team up to fight a new villain. Another could be the OC being from a different dimension and Max has to help them get back home while also dealing with threats in their own world. And sometimes, the OC might be a scientist who creates a new technology that helps Max in his battles.
One idea could be a crossover with the Power Rangers Dino Charge. The Ninja Steel Rangers could team up with the Dino Charge Rangers to fight a common, powerful enemy that threatens both their worlds. They could combine their powers and weapons in unique ways, like creating a new zord by merging the Ninja Steel Megazord with the Dino Charge Megazord.
One interesting Max Steel fanfiction could be about Max's new powers emerging in unexpected ways. For example, he might discover he can control a new type of energy that wasn't part of his original set of abilities. This could lead to him having to learn how to use it while also facing a new enemy who is attracted to this new power.
One interesting plot could be that Max and Eleven start to have dreams that seem to be connected. They realize that these dreams are actually visions of a future threat to Hawkins. So, they begin to investigate what these threats are and how to stop them. Along the way, they might encounter some old enemies from previous seasons as well as new ones, and they have to use their combined powers and wits to overcome all obstacles.
One interesting plot could be the Avengers facing a new, super - powerful villain made of an unbreakable steel - like substance. They have to figure out how to defeat it without their usual methods working.
One interesting 'Naruto Max Steel' fanfiction could be a story where Naruto gains Max Steel's powers. He could use the Turbo Strength to defeat powerful enemies in the Naruto world like Madara Uchiha in a really epic battle. Another might be a story where the technology from Max Steel's world is introduced into the Hidden Leaf Village, changing the way ninjas train and fight.
Another good character could be Goku from Dragon Ball Z. It might seem like an odd combination, but think about it. Goku's super strength and Max Steel's technological abilities could create a really unique dynamic. They could face off against a powerful enemy that requires both brute force and advanced weaponry to defeat.