One possible plot twist could be that the TMNT initially think the Young Justice team are enemies due to a misunderstanding. For example, they might see the Young Justice team using high - tech gadgets and assume they're working for an evil organization. Then, as they start to fight, they realize they have a common enemy and have to team up.
One possible plot twist could be that the TMNT turn into dragons not because of some magic spell gone wrong, but because it's an ancient prophecy. They are the only ones who can save the city in their dragon forms from a powerful, otherworldly threat. As dragons, they have new powers like breathing fire or flying at supersonic speeds, which they use to fight the enemy.
A possible plot twist is that the kiss is part of a prophecy. In the TMNT universe, there could be an ancient prophecy that foretold of a kiss between Leo and April which would either save or doom the world. So after the kiss, they start to discover clues about what this really means for them and their friends. Or perhaps the kiss is seen by an unexpected observer who then spreads false rumors about it, which leads to all sorts of misunderstandings within their community.
One possible plot twist could be that Mikey was kidnapped by an unexpected enemy, like a former ally who turned bad. Maybe it was someone he trusted, and this betrayal adds a layer of drama.
A possible plot could be that Damian Wayne, while on a solo patrol, stumbles upon a Young Justice operation gone wrong. He steps in to help but is critical of their mistakes. This starts a tense relationship. As the story progresses, they are forced to work together on a larger threat that endangers not only Gotham but also the world. Along the way, Damian starts to understand the importance of friendship and trust within a team, which is something he hasn't really experienced before. And the Young Justice team also learns to see past Damian's prickly exterior and appreciate his skills and determination.
One exciting plot twist could be that the power sources of both universes get mixed up. For example, Thor's hammer Mjolnir suddenly responds to Shazam's call, and Shazam has to figure out how to handle the Asgardian magic. This would create a lot of chaos and interesting character interactions as the heroes from both sides try to understand what's going on and get their powers back to normal.
One possible plot twist could be that Sesshomaru's mother initially mistakes Kagome for a threat and tries to attack her. But then, upon realizing Kagome's connection to Inuyasha and her kind heart, she decides to protect Kagome instead. This would completely change the dynamic between them from hostility to an unlikely alliance.
One possible plot twist could be that Sesshomaru initially mistakes Kagome for someone else. Maybe he thinks she's a powerful priestess from his past. This could lead to an interesting dynamic where he's initially hostile but then realizes she's not who he thought. And it might change his view on humans in general as he gets to know Kagome better.
One possible plot twist could be that Snape is actually there to spy on the Death Eaters for Dumbledore, but the other Death Eaters start to suspect him. Maybe he accidentally reveals some knowledge that only a spy would know. For example, if he knows about a secret mission that was supposed to be only known within the Order of Phoenix. Another twist could be that Snape has a secret agenda of his own that is different from both Dumbledore's and Voldemort's. He might be trying to manipulate the situation within the Death Eater meeting to his own advantage, perhaps to gain some sort of power or information that could be used as a bargaining chip later. And finally, there could be a twist where a new character shows up at the meeting who has some sort of connection to Snape's past, and this changes the dynamics of the meeting completely.
One common plot twist could be that Robin's injury was a setup by a hidden enemy within the Young Justice team. This would lead to a lot of internal conflict as the team members try to figure out who could have done such a thing.
One possible plot could be that the failsafe is accidentally triggered. The Young Justice team then has to figure out how to stop it from causing more harm while also dealing with the immediate threats it creates.