Well, 'invincible mark and eve fanfiction' could cover a wide range of themes. It might explore their relationship in different scenarios. For example, it could show their adventures together, how they support each other in battles. Mark might use his powers in unique ways to protect Eve, and Eve could use her intelligence to assist Mark. It could also delve into their emotional bond, like how they deal with the pressures of being in a world full of challenges while being in a relationship.
In many 'Batman Beyond' fanfictions where Dana finds out, it could be about her finding out Bruce Wayne is Batman. Maybe she stumbles upon some evidence in the Batcave or notices some similarities in Terry's behavior to Bruce. For example, she might notice Terry's fighting style is similar to what she's heard about Batman's. It could also be that she discovers some secret technology related to Batman that leads her to the truth.
A common plot could be their struggle against a new and powerful villain. This villain might be stronger than any they've faced before, and they have to rely on each other more than ever. Another plot could be a misunderstanding between them that causes a rift in their relationship, which they then have to work hard to repair.
Ginny's reaction could also involve a sense of helplessness at first. But then she'd quickly gather herself and use her resources. For instance, she might call on her friends and family for help. She'd be by Harry's side constantly, using her presence to comfort him and also using her knowledge of magic to try and ease his pain.
For Merlin, there are both good and bad consequences. On the bad side, some of the more traditional and anti - magic people in Camelot might try to oppose him. However, since Arthur now knows, he has a powerful ally. Arthur can protect Merlin from those who would do him harm. Also, Merlin can now be more open about using his magic for the good of Camelot, which is a positive change.
She might be overjoyed. After all, Naruto is her son. She could immediately rush to find him and embrace him tightly, tears of happiness streaming down her face.
Well, one possibility is that Dark Naruto would be overjoyed. After all, Kushina is his mother. But at the same time, he could be very conflicted. His dark side might make him suspicious of her motives. He could test her in various ways to see if she's really who she says she is. And Kushina, on her part, would probably be heartbroken to see what her son has become.