She could be confused at first. Fanfiction can be quite different from the actual story, and Abby might need some time to understand the concept if she's not familiar with it.
Abby may be a bit hesitant at first. She's used to the official storylines and this fan - made content could be new to her. If the fanfiction has Clarke in a romantic or heroic light related to the Nightblood aspect, Abby might be a bit more accepting. She may view it as a creative expansion of the world they live in. However, if it goes against her values or the way she sees Clarke growing and developing, she will likely oppose it and try to distance Clarke from it.
Abby's reaction would depend on the content of the fanfiction. If it's a well - written story that respects Clarke's character, she might be intrigued. She could see it as a form of flattery to Clarke. But if it contains false or negative portrayals, she would be unhappy. She may think that the author doesn't understand Clarke properly and might even want to correct the misinformation. For instance, if the fanfiction has Clarke doing something completely out of character, Abby would be disappointed as she knows Clarke's true nature very well.
If Abby is open - minded about the fanfiction, it might not have much impact. But if she's not, she could start to view Clarke in a different light. For instance, if the fanfiction has some wild and uncharacteristic ideas about Clarke, Abby might subconsciously start to question Clarke's real motives or actions in a way she didn't before. This could gradually erode their relationship as Abby becomes more distant or critical.
She might be initially shocked. If the fanfiction contains some untrue or inappropriate things about Clarke, Abby could be protective and try to find a way to stop it from spreading.
Abby might react quite strongly. Given her relationship with Clarke, she would likely be very interested in what is being written about her in the fanfiction. She may try to find the author to ask about their intentions. If the fanfiction has Clarke in some sort of dangerous or inappropriate situation, Abby would probably be quite worried and might even try to get it removed. However, if it's a positive and creative take on Clarke, she could see it as a compliment to her daughter - like figure and might encourage others to write more positive fanfiction about her.
Batman may be slightly annoyed. He's a very private and serious person. The idea of people writing fictional stories about a character like Slade, especially if they were inaccurate or glorifying Slade in some way, could irk him. He might think it was a waste of people's time when they could be focusing on more important real - world issues.
Alphys would likely be very confused at first. She's used to her own types of fan - related interests, and this would be something new and strange. She might think it was some sort of strange new trend in the Undertale fandom that she didn't know about. As she thought more about it, she could become more accepting, especially if she realized it was just a creative expression of the fans. But it would definitely take her some time to get used to the idea.
In this fanfiction, Abby and Clarke are likely characters within a particular fictional universe. They could be friends, colleagues, or even have a more complex relationship like a mentor - mentee relationship.
She could be amused. Fanfiction can be really funny sometimes, especially when it takes the characters in unexpected directions.
She might be overjoyed. Abby has a deep connection with Clarke, and in fanfiction, her first reaction could be pure elation. She would probably rush to see Clarke immediately, tears of happiness in her eyes.
It could make her more determined. Abby might have been in a slump or feeling lost before finding out Clarke was alive. Now, with Clarke back, she could become more focused on their shared goals, like saving their people or fighting against a common enemy.
She could be ecstatic. After all, if they have a close relationship, the thought of Clarke being alive would be like a dream come true for Abby.