They might be amused. Gods in Greek mythology often have a sense of humor. If they read fanfiction about their own world, they could find the creative interpretations of mortals quite entertaining.
Well, it could lead to a lot of different reactions. Some gods might be offended if the fanfiction portrays them in a way that goes against their self - image. For example, if a fanfiction shows Zeus as a bumbling fool instead of the powerful king of the gods, he might be angry. On the other hand, gods like Hermes, who is more laid - back, might find it funny and share it with the other gods just for the laugh. And then there are gods like Aphrodite who might be interested in how she is depicted in matters of love and beauty in the fanfiction.
If the gods read the last olympian fanfiction, it would be a chaotic situation. They might start interfering in the mortal world based on what they read. For instance, if the fanfiction predicts some doom for a particular hero, the gods might try to either prevent it or ensure it happens depending on their own agendas. They could also use the ideas from the fanfiction to play tricks on each other. Imagine Poseidon using a plot device from the fanfiction to prank Athena. It would be a very interesting and unpredictable turn of events.
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Chapter 149, "Supreme Combat Body, The Dangerous Gao Yu【Please Vote】", is the clearest early answer because it turns Intermediate Strange Monster's situation into a concrete plot event. The chapter turns that into something concrete by moving from As expected, hearing it would take two days, a smile immediately... to Greetings, Leader, and all the esteemed sirs!" Tong Xinglong and the....
Chapter 198, "Clearing Meridians, Breakthrough Imminent (Part 4)", is the clearest early answer because Alchemy Workshop finally turns buildup into a real advancement. A useful checkpoint is the way the scene starts with But as he instructed Yuwen Dao to start using Beast Blood directly in... and follows through with As the cauldron emitted a glow, lines began to gradually appear on....
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