Perhaps a plot where the Tyranids are actually from a parallel dimension that is starting to merge with the Star Wars galaxy. This would bring in elements of interdimensional travel and the characters would have to figure out how to close the rift while also dealing with the Tyranids that are pouring through. It could also lead to some interesting team - ups, like Jedi and bounty hunters working together to stop this invasion from another realm.
One interesting plot could be that the Tyranids are the result of an ancient experiment by an extinct civilization in the Star Wars galaxy. The fanfic could explore the history of this civilization, how they created the Tyranids, and why they lost control. The main characters would then have to follow the breadcrumbs of this ancient past to find a way to stop the Tyranids. Along the way, they might discover secrets about the Force and the very fabric of the galaxy that were lost with that ancient civilization.
The Tyranids could be incorporated into a Star Wars fanfic as a bio - engineered weapon gone wrong. Imagine some mad scientist in the Star Wars universe trying to create a powerful new life form for warfare, but it gets out of control and turns into something like the Tyranids. This would add an interesting layer of mystery and danger, as the characters in the fanfic would have to figure out how to stop this new, ravenous threat that is rapidly spreading across the galaxy.
One interesting plot twist could be that Harry starts to use Sith magic against Voldemort. It would completely change the dynamic of the fight. Another could be that Darth Zannah has her own motives for training Harry, like using him as a pawn in a bigger battle between the Sith and the Jedi in the Star Wars universe.
The plot could involve the Rebels using the knowledge from the Clone Wars to their advantage. Maybe they discover a long - forgotten battle strategy that was used by the Jedi in the Clone Wars. They then adapt it to a mission against the Empire. Also, the characters could have different reactions to the Clone Wars heroes and villains. Hera might admire some of the Clone Wars leaders, while Zeb could be more critical of the actions of some of the clones.
In some 'Star Wars Star Forge' fanfiction, one interesting plot point is the discovery of hidden technology within the Star Forge. This could be something that changes the balance of power in the galaxy. Another is the idea of the Star Forge being a key to an ancient prophecy. For example, in one story, it was prophesied that the one who controls the Star Forge will bring either great destruction or great peace.
In some 'Star Wars Thor fanfic', the idea of Thor being a Jedi - like figure is really fascinating. He uses his own moral code, which is similar in some ways to the Jedi code, but with his Asgardian twist. Also, the crossovers where Thor has to face off against Darth Vader are intense. The clash between Vader's dark side powers and Thor's godly powers makes for some epic battles. And then there are the fanfics where Thor helps to restore balance to the Force in the Star Wars universe, which is an interesting take on the concept of the Force.
One idea could be focusing on a young clone trooper who discovers he has unique Force abilities. He then has to hide this from his superiors while trying to figure out what it means.
One idea could be exploring the backstories of the clone troopers in more detail. Maybe focus on a particular clone and his relationships with his brothers. Another could be creating a new adventure for Anakin Skywalker during the Clone Wars that wasn't shown in the original series. For example, he could be sent on a secret mission to a planet that has a powerful and ancient Sith artifact.
Definitely the Lotus from Warframe. She could be like a wise advisor to the Jedi Council, sharing her knowledge of the Orokin and the Tenno. And Darth Vader would be a great addition too. Imagine the confrontation between him and a powerful Warframe like Excalibur. It would be an epic battle of light and dark powers.
For me, Yoda and Cortana would be an interesting pairing. Yoda is a wise and ancient Jedi Master, full of knowledge about the Force and life in general. Cortana is an AI with vast knowledge of technology and military strategies. They could have some really deep and thought - provoking conversations. Yoda might be able to teach Cortana about the spiritual side of things, and Cortana could share her technological insights with Yoda.
Twilight Sparkle and Yoda would be an interesting pairing. Twilight is very studious and knowledgeable, and Yoda is a wise Jedi Master. They could exchange knowledge about magic and the Force. Another good pairing could be Rainbow Dash and Han Solo. Rainbow Dash is brave and adventurous, similar to Han Solo's roguish nature.