A less obvious but still common theme is family. In Steven Universe, family is a big part of the story, and in Danny Phantom, Danny has his family around him. In fanfiction, it could be about how their families react to their new friendship or the new world they are in. For example, Danny's parents might be curious about the Gems, and the Gems might be confused about Danny's human - ghost family dynamic.
One common theme is friendship. In both shows, friendship is important, and in fanfiction, it often shows Danny and Steven forming strong bonds. Another theme is power. How they use their powers in new and different situations, like when Danny's ghost powers interact with Steven's Gem powers.
One great Danny Phantom and Steven Universe fanfiction is 'The Crossover Adventure'. It combines the unique elements of both universes in an exciting way. The characters interact in a really interesting manner, like Danny and Steven teaming up to solve a mystery that involves both the Ghost Zone and Gem technology.
Love and friendship are common themes. Their relationship, whether it's a budding romance or a deep platonic bond, is often explored.
One common theme is the struggle between good and evil within Danny. It often shows how his normal self battles his evil side. Another theme is the impact on his relationships. His friends and family have to deal with this new, dangerous Danny.
One common theme is family. Since they are siblings, a lot of fanfics explore their family bond, like how they rely on each other and protect one another. Another theme is secrecy. Danny has to keep his ghost identity a secret, and Jazz often gets involved in that secrecy, either by helping him keep it or by accidentally finding out. Growth is also a theme. As the story progresses, both Danny and Jazz grow as characters, both in their personal lives and in dealing with the supernatural elements around them.
One common theme is the power struggle. Ember has her own set of powers and often tries to overpower Danny, either for her own gain or just for the fun of it. So there's a constant back - and - forth in terms of who's in control.
One common theme is the exploration of their relationship. Whether it's a friendship or a budding romance, it's often at the center of the story. For example, in many fanfictions, Danny tries to protect Paulina from ghosts, which shows his care for her.
A very frequent theme is the idea of redemption. Some fanfictions explore whether Vlad can be redeemed through his relationship with Danny. It's about whether Danny's goodness can rub off on Vlad or if Vlad is too far gone. There's also the theme of family, as Vlad sees Danny as a sort of surrogate son, and this adds a whole layer of complexity to their interactions. They can be like a dysfunctional family, with all the drama and emotional turmoil that comes with it.
Another theme is the idea of overcoming obstacles. In a lot of these fanfictions, there are things like Danny's ghost - hunting duties or Sam's family issues that they have to get past before they can have that kiss. It adds drama and depth to the story. For example, in some, Danny has to balance his secret identity with his growing feelings for Sam, and this creates tension until they finally share the kiss.
One common theme is the relationship between Danny and Kitty. It often explores their dynamic, whether it's a budding romance or a complex friendship.
A common theme is the struggle between good and evil within Danny himself. Since Dark Danny is Danny's dark side personified, it's all about Danny facing his own inner demons. For example, in many fanfictions, Danny has to deal with the temptation to give in to the power that Dark Danny represents.