some lines shouldn t be crossed

In Harry Potter fanfiction, 'lines crossed' could refer to a character crossing moral or ethical boundaries. For example, a normally good character might be written to do something unethical like using dark magic for personal gain. This can add an interesting twist to the story and explore the complex nature of the characters.

I don't quite understand the exact meaning of your sentence," I cut the red line and crossed over in ancient times." If you want to understand the content of online novels related to cutting red lines in ancient times and then transmigrating, the current reference materials do not involve such specific online novels. If you want to ask if the act of cutting red strings in ancient times had any connection with transmigration, from the perspective of history or the general concept of transmigration, there is no known direct connection. Cutting red strings mostly appears in traditional customs such as the concept of pulling red strings, which is quite different from the concept of transmigration.

Sure. One example could be a fanfic where Harry uses the Imperius Curse on his friends without any real justification. This is a clear crossing of a moral line as the Imperius Curse is an unforgivable one in the Harry Potter world. Another example might be a story where Dumbledore is portrayed as a power - hungry dictator rather than the wise and benevolent headmaster we know from the books, which is a significant deviation from the canon.

The main plot of a time-traveling novel was usually about the experience of the transmigrator in this new environment, while the secondary plot was about the people and things around the transmigrator. Here are some common topics and storylines of time-travel novels: Search for the truth of history: The main storyline of many time-travel novels is the adventures and challenges experienced by the time-traveler in the process of searching for the truth of history. These novels usually involved some historical events and characters. The transmigrators needed to explore and investigate to solve the historical mysteries and reveal the true story. For example," Return to the Ming Dynasty as a Prince "," Lord Snow Eagle ", etc. 2. Changing history: Some time-travel novels had the main storyline of the transmigrator changing the course of history and causing history to change. These novels usually involved historical events and characters who needed to change the direction of history through actions and decisions. For example, Battle Through the Heavens, Great Dominator, etc. 3. Saving the world: There were also some time-traveling novels where the main line was that the transmigrator saved the world or changed the fate of the world. These novels usually involved some mythical or sci-fi elements. The transmigrator needed to use his own ability and wisdom to solve problems and change the situation of the world. For example,"Full Time Expert","Douluo Continent", etc. 4. Love and marriage: The secondary thread of some time-travel novels was the emotional entanglement between the time-traveler and the people and things around him. These novels usually involved some love stories and marriage stories. The transmigrator would meet various types of characters, experience various emotional entanglements, and finally find a suitable life partner. For example,"Startling Step by Step,""Hua Qian Gu," etc. The above are some common time-travel novel topics and storylines. Of course, there are many other different choices and creative readers who can choose to read according to their preferences.

In some crossed comics, animals can be crossed. It depends on the creativity and imagination of the comic creator.