However, it could be that there's someone else pulling the strings. Maybe a new villain has hired Red X to capture Starfire. This new villain could be the real antagonist, with Red X just being a tool. In some fanfictions, it's common to have a hidden mastermind behind the obvious bad guy. So, it might not be as straightforward as just Red X being the bad guy all on his own.
Another idea is that the main antagonist is actually an aspect of Starfire herself, represented by the 'Oozing Red X'. It could be some sort of dark side of her that has manifested in this form. So she's not just fighting an external foe, but also this internal struggle that is personified by the 'Oozing Red X'.
Well, it could involve Starfire trying to break free from the bindings physically. Maybe she uses her alien strength or some hidden powers.
One possible plot could be that Terra is constantly trying to break free from the physical bindings created by Red X. Terra might use his/her powers of earth manipulation to counter the technological or magical nature of the bindings. Maybe Terra discovers a weakness in the bindings by observing Red X's behavior during their encounters.
Cyborg might be another ally. His technological expertise could be used to analyze the bindings. He could potentially find a way to disrupt the power source of the bindings or create a device that can weaken them. Also, his strength and combat abilities could be useful in fending off Red X if necessary.
Obviously, Red X would be the main antagonist as he is the one doing the kidnapping. But there could also be other antagonists in the background. For example, if Red X was working for someone else, that person could also be an antagonist. Maybe a powerful intergalactic criminal who wants Starfire's powers for his evil plans.
Other minor characters from the Teen Titans universe might also make an appearance. Maybe some of the villains that are associated with Red X could be there in the background, influencing his actions towards Starfire. Or some of the civilians that the Teen Titans protect, who could be caught in the crossfire of this struggle between Starfire and Red X, and their presence could add more complexity to the story.
The main characters are obviously Starfire and Red X. Starfire is a well - known character from the Teen Titans series, with her superhuman strength, flight ability, and starbolts. Red X is a more mysterious character, often causing trouble and having a complex personality.
In fanfiction, Starfire might struggle in Red X's grip due to their opposing natures. Red X is often depicted as a more morally ambiguous character compared to Starfire's pure - hearted self. His grip could symbolize her being caught in a situation that challenges her beliefs and values.
Obviously, the Red X goo itself can be considered a main antagonist. It's the thing that's causing Starfire to struggle, so it's a direct source of conflict.
One common theme could be the struggle of Starfire against the challenges presented by Red X. It might involve themes of power imbalance, as Red X is often a more morally ambiguous character compared to Starfire. Another theme could be the exploration of Starfire's character growth as she faces this new and difficult situation.