One common theme is the struggle for identity. OCs often have to figure out where they stand in the world of ghouls and humans. For example, they might be half - ghoul and have to decide which side to embrace.
Survival is also a big theme. Just like in the original Tokyo Ghoul series, where ghouls have to struggle to survive in a world that fears and hunts them, when combined with Naruto's world, characters from both sides often find themselves in situations where they have to fight for their lives. This can be against new threats created by the combination of the two universes or against the original enemies from each series.
One common theme is the struggle between the human and ghoul nature. The OC Ripper, being an original character in the Tokyo Ghoul universe, often has to deal with the duality of having human emotions and the blood - thirsty instincts of a ghoul. Another theme could be isolation. Since ghouls are hunted and feared, the OC Ripper might find themselves alone, not fully belonging to either the human or ghoul society. Also, themes of revenge can be present. Maybe the OC Ripper has a past filled with pain caused by humans or other ghouls and is seeking vengeance.
The theme of friendship in the face of adversity is quite common. They are in a world full of conflict between ghouls and humans, yet they form a connection. There's also the theme of sacrifice. In some fanfics, one may sacrifice for the other to uphold their new - found relationship or to protect the greater good in the Tokyo Ghoul universe.
One common theme is the exploration of their complex relationship. Given their different personalities and backgrounds within the Tokyo Ghoul universe, fanfics often focus on how they interact, whether it's a love - hate relationship or a gradual understanding and acceptance.
Self - acceptance is a very prevalent theme. The two Kanekis need to come to terms with their own existence and their relationship with each other. Identity crisis is also common. They both represent different aspects of Kaneki's identity and the fanfic often explores how to reconcile these different identities. Additionally, the theme of power and control can be seen, as they may fight over who gets to be in control in certain situations.
Love and acceptance are very common themes. Given that Kaneki is a half - ghoul and Touka is a full ghoul, their relationship often explores how they accept each other's differences.
Yes, it is quite common. Fans are always eager to explore more of the world they love, and fanfiction provides an opportunity to do that.
Another theme is the search for identity. Ghouls in the fan fictions often question who they are, especially those who have some human connections or memories. For example, a ghoul who was once human might struggle with their new identity.
Power struggle is a common theme. You have the super - powered beings from Prototype and the ghouls from Tokyo Ghoul, all vying for control or survival in a merged world.
One common theme is the struggle for identity. Female Kaneki, being both human and ghoul, constantly has to figure out who she really is. This is often explored through her interactions with both humans and ghouls, and how she feels like she doesn't fully belong to either group.