Who could be the main antagonist in a Kirby Star Dream fanfiction?

Dark Matter could be the main antagonist in this crossover. Dark Matter is a powerful and menacing force in Kirby's world. In the crossover, it could have somehow found a way to cross over into Sonic's world and is corrupting it. Sonic and Kirby have to find a way to stop Dark Matter from spreading further. Dark Matter tries to use Sonic's speed against him by creating dangerous obstacles in his path and Kirby has to use his various powers to help Sonic overcome these while also directly fighting Dark Matter.

Perhaps an ancient demon that was sealed by the Star Sage long ago has now broken free and is seeking revenge. It sees the descendants of the Star Sage as a threat and tries to eliminate them one by one. The main characters then have to find a way to defeat this demon using the limited knowledge they have about the Star Sage.

A powerful and evil dragon could be the main antagonist. This dragon might have a grudge against the dragon slayers in general and specifically targets Lucy because of her growing reputation as a star dragon slayer.

It could be a rogue Sith Lord who has broken away from the traditional Sith teachings and is causing destruction in his own way. He might not be interested in the age - old battle between the Sith and the Jedi but just wants to spread chaos for his own reasons.

Perhaps an ancient evil force that Darth Vectivus accidentally awakens. This force is much more powerful than him and starts to control him, making him do things he doesn't really want to. Now Darth Vectivus has to find a way to break free from this new master while also dealing with the rest of the galaxy that sees him as the bad guy.

It could be a rogue member of the Star Fox organization who has turned against them for personal gain. This character might have once been a respected member but became corrupted by power or money.

Darth Vader could be a great main antagonist. His power in the Force and his imposing presence would be a huge threat to The Flash. He could try to capture The Flash to study his speed abilities for the Empire.

Perhaps a super - fan of either Drake or Taylor who is overly possessive. This fan doesn't want their idol to be associated with the other artist and starts spreading false rumors and causing trouble between them. For example, they might hack into social media accounts to create misunderstandings.

It could be a mysterious figure that only exists within Naruto's dream world. This figure might be trying to keep Naruto trapped in the dream forever, preventing him from waking up and returning to his real life. Maybe it's a manifestation of Naruto's insecurities or fears, taking on a physical form within the dream to torment him.

The main antagonist could be a rogue Imperial officer who has his own agenda. He's tired of following the Emperor's orders and decides to create his own power base. He targets Delta Squad because they keep getting in the way of his plans to steal valuable resources and technology from various planets.