Sure. In one plot, Voldemort returns with an army of new dark creatures. Hogwarts is under siege. The teachers tell the students to save themselves as they try to hold off the attackers. The students then have to use their knowledge of hidden passages and spells they've learned on their own to escape through the Forbidden Forest.
It could mean that in a Harry Potter fanfic, there's a situation where characters are urged to save themselves. Maybe it's during a dangerous encounter like a battle with dark wizards or facing some deadly magical traps.
I'm not sure of a specific 'Harry Potter palindrome fanfic' off the top of my head. But it could be something like a story where the prophecy is written as a palindrome. For example, 'Otto saw I, I saw toot' where 'Otto' could be a character's name and the prophecy has a hidden meaning related to Harry Potter's destiny.
Sure. One example could be a fanfic where a character discovers a hidden grotto near the Black Lake. When they enter, a magical waterfall suddenly appears and drenches them. That's a 'wet surprise'.
In the fanfic, the arithmancer could play the role of a protector. They use their knowledge of Arithmancy to detect and prevent dark magic attacks. By analyzing the numerical patterns of dark magic spells, they are able to set up numerical defenses that disrupt the spells. For instance, if a dark wizard is trying to cast a curse, the arithmancer can create a counter - spell by adjusting the numerical balance of the surrounding magic.
Sure. In one possible plot, Harry starts to develop feelings for a new girl at Hogwarts. Hermione, thinking that the girl is only interested in Harry because of his fame as 'The Boy Who Lived', constantly interrupts their dates and private conversations. For example, she might show up with a big stack of books and demand Harry's help with studying right when he's about to kiss the girl.
Sure. One possible plot could be that Draco Malfoy gets a restraining order against Harry Potter after a particularly nasty duel. Malfoy claims that Harry's use of magic was too aggressive and he feels threatened. The story could then revolve around how this affects their relationship at Hogwarts, and how the wizarding community reacts to such a strange situation in the middle of their magical world.
Maybe in the fanfiction, a new dark wizard rises to power even more powerful than Voldemort. He creates a reign of darkness by spreading a dark plague across the wizarding world. This plague turns wizards into his mindless slaves. Harry's son or daughter has to step up and find a cure while also leading a resistance against this new dark force. They might have to travel to far - flung places in the wizarding world to find the ingredients for the cure and allies to help in the fight.
A story where Harry is a detective in a modern - day city and has no connection to magic or the Potter - like world at all. This would be an example where he is not part of a Potter fanfiction as it completely deviates from the Potter universe's concepts.
In a different fanfic, Ron stumbles upon a diary that belonged to one of the original Hogwarts students. In it, he finds the knowledge of a secret dueling technique that was long forgotten. Ron practices this technique and when he faces off against a bully in the school, he uses this new - found knowledge to defeat him easily. His knowledge of this special dueling method gives him the power to stand up for himself and others, which is a great example of how 'knowledge is power' can be shown in a Harry Potter fanfic.
I haven't actually read a fanfic specifically about 'Timely Errors', but it could be something like a character forgetting to cast a protection spell right before a dark wizard attacks. That would be a very timely error with serious consequences.