The themes could also include redemption. After kidnapping Marco, Tom might realize the error of his ways and try to make amends. And there could be a theme of friendship. Even though Tom has kidnapped Marco, the story could explore if their friendship can be salvaged.
I'm not sure specifically which 'tom kidnaps marco fanfiction' you are referring to. There could be many different interpretations and stories with such a premise in the fanfiction world. It might involve a complex plot where Tom, for some reason, decides to kidnap Marco. Maybe it's due to jealousy, or a misunderstanding in their relationship within the context of the original story it's based on.
It could be an estranged family member with a grudge. Perhaps a relative who feels wronged by Marco's family and decides to take revenge by kidnapping Marco. Or it could be a deranged fan who has an unhealthy obsession with Marco and wants to keep him all to himself.
Some stories might have the theme of unexpected alliances. For example, Marco could form an alliance with another captive or even with one of the kidnapper's minions who has a change of heart. There's also the theme of self - discovery. Through the harrowing experience of being kidnapped, Marco might learn things about himself that he didn't know before, such as his inner strength and resourcefulness.
Star would be a likely candidate to rescue Marco. She has strong magical abilities and a deep friendship with Marco. She would stop at nothing to find him and bring him back safely.
In this fanfiction, their love might also face challenges. There could be external forces trying to keep them apart. Maybe there are rules in Heckapoo's world against such relationships. But they would fight for their love. Their story could be filled with moments of doubt, but also great passion. It could be a story of two beings from different worlds defying the odds to be together.
One idea could be that Madara kidnaps Naruto to use him as a bargaining chip against the Hidden Leaf Village. He might want to force the village to give up certain secrets or strategic locations. Maybe he believes Naruto's unique power can be harnessed for his own evil plans.
One possible scenario in this fanfiction could be that Loki disguises himself and lures Spiderman into a trap. He then transports him to a different realm where Spiderman is completely out of his element. Spiderman would have to rely on his wits and basic powers to try and escape Loki's clutches.
Well, if we're talking about a 'Hook kidnaps Wendy' fanfiction, it could be really interesting. Maybe in this fanfic, Hook has some complex motives for kidnapping Wendy. It could be a part of a revenge plot against Peter Pan, or perhaps he has some unexpected feelings for Wendy and this is his strange way of expressing it.