At first, Sans would probably be a bit shocked, but then he'd turn on his laid - back, sarcastic attitude. He might make jokes at Gaster's expense, which could either annoy Gaster or make him respect Sans more. If Gaster tries to harm him, Sans could use his shortcuts to dodge attacks and try to find a way to reverse the situation. He'd also likely be thinking about how this affects his friends in the Underground, especially Papyrus, and try to find a way back to them.
Twilight would be excited to explore a new fictional universe. She'd start taking notes on the magic systems and different worlds in the fanfiction. Rainbow Dash would be bored if there wasn't enough action. She'd be looking for epic battles and heroic deeds. Pinkie Pie would love the fanfiction just for the fun of it, no matter what it was about.
Often, they interact with a lot of patience. They sense the reader's pain and are gentle. For example, they might start by just being a quiet presence around the reader. They slowly build trust, like in a story where a Sans from an AU offers the reader a small gift as a sign of friendship without pushing too hard.
Papyrus might be initially shocked. He's used to Sans being more laid - back, so seeing him in a fight could be quite a surprise. His eyes would widen and he might gasp.
In fanfiction, the reactions in the Pokemon world to FLIM from MLP would be diverse. The Pokemon that are friendly and trusting, like Eevee, might initially be drawn to FLIM. However, as they get to know him better, they might realize his true nature. The villains in the Pokemon world, like Team Rocket, might see FLIM as either a competitor or a potential tool. They could try to use his skills for their own evil plans. Meanwhile, the regular citizens of the Pokemon world, such as the people in the various towns, would be cautious. They have a peaceful life, and FLIM's arrival with his business - minded and sometimes sneaky ways could disrupt their normal routine. So they would keep an eye on him to make sure he doesn't cause any problems.
Twilight Sparkle would probably be devastated. She looked up to Celestia as a mentor, so she might go into a state of deep mourning at first. But then, she could be motivated to try and fill the void Celestia left, using all the knowledge Celestia had imparted to her.
Some MLP fans might be really into it. They'll enjoy the new and different story - telling style compared to MLP. Others might be a bit confused at first, since DBZ is so different in terms of genre. But overall, a good portion of them could end up finding it interesting.
Some fanfictions might depict the MLP being excited. They could see the human as a novelty, something completely different from what they're used to in Equestria. They might immediately start asking questions, like where the human came from and what their world is like.
The ninja world would be in shock. The Hidden Villages would be very cautious around Naruto. They might see him as an even greater threat or an unknown entity. His friends, like Sakura and Sasuke, would have to adjust to this new Naruto and learn how to fight alongside him with his new powers.
First, don't be intimidated by the vastness of the Aus Sanses fanfiction world. Begin with the simpler, more well - received ones. Look for fanfics that have good reviews or high ratings. Another tip is to follow your interests. If you like action - packed stories, search for Aus Sanses fanfiction that focuses on battles or quests. If you're more into character - driven plots, look for ones that explore Sans' emotions and relationships in the different AUs. And always keep an open mind as you explore this unique form of fan - created literature.